diff --git a/src/ts/@overflow/commons/application/application.ts b/src/ts/@overflow/commons/application/application.ts
index a62f9d6..55608fa 100644
--- a/src/ts/@overflow/commons/application/application.ts
+++ b/src/ts/@overflow/commons/application/application.ts
@@ -12,45 +12,69 @@ import {
   RunnerAnnotation,
   WebApplicationAnnotation,
 } from './decorators';
-import { InstanceDefinition } from '@overflow/commons/di/factory';
 
 export class Application {
-  private _primaryClass: ClassType;
+  private _appClass: Class;
+  private _appAnnotation: WebApplicationAnnotation;
   private _applicationContext: ApplicationContext;
 
-  public static async run(primaryClass: ClassType): Promise<ApplicationContext> {
-    let app: Application = new Application(primaryClass);
-    return app.run();
+  public constructor(primaryClass: ClassType) {
+    this.initialize(primaryClass);
   }
 
-  public constructor(primaryClass: ClassType) {
-    this._primaryClass = primaryClass;
+  private initialize(primaryClass: ClassType): void {
+    let clazz: Class = Class.forClassType(primaryClass);
 
-    this.createContext();
+    let wa: WebApplicationAnnotation = clazz.getOwnAnnotation(WebApplicationAnnotation);
+    if (undefined === wa) {
+      throw new Error(`Class is not WebApplication type. add @WebApplication annotation to class[${primaryClass.name}]`);
+    }
+
+    this._appClass = clazz;
+    this._appAnnotation = wa;
+  }
+
+  public static async run(primaryClass: ClassType): Promise<ApplicationContext> {
+    return new Application(primaryClass).run();
   }
 
   /**
    * run
    */
   public run(): ApplicationContext {
+    this._applicationContext = new ApplicationContext();
+
+    let injectables: ClassType[] = this.getInjectables();
+    this._applicationContext.instanceDefinitionReader.registerInjectables(...injectables);
+
     let runner = this.findRunner();
     if (undefined === runner) {
-      throw new Error(`There is not exist @Runner on Application[${this._primaryClass.name}]`);
+      throw new Error(`There is not exist @Runner on Application[${this._appClass.getName()}]`);
     }
     let instanceFactory = this._applicationContext.instanceFactory;
 
-    let clazz: Class = Class.forClassType(this._primaryClass);
-    let instance = clazz.getConstructor().newInstance();
-    instanceFactory.applyInstance(this._primaryClass, instance);
+    let instance = instanceFactory.getInstance();
 
     runner.invoke(instance);
 
     return this._applicationContext;
   }
 
+  private getInjectables(): ClassType[] {
+    let injectables: Set<ClassType> = new Set();
+    injectables.add(this._appClass.getType());
+    this._appAnnotation.attributes.injectables.forEach(injectableType => {
+      injectables.add(injectableType);
+    });
+    this._appAnnotation.attributes.configurations.forEach(configurationType => {
+      injectables.add(configurationType);
+    });
+
+    return Array.from(injectables);
+  }
+
   private findRunner(): Method | undefined {
-    let clazz: Class = Class.forClassType(this._primaryClass);
-    let methods = clazz.getOwnMethods();
+    let methods = this._appClass.getOwnMethods();
 
     for (let key of Array.from(methods.keys())) {
       let method = methods.get(key);
@@ -64,59 +88,58 @@ export class Application {
     return undefined;
   }
 
-  private createContext(): ApplicationContext {
-    let clazz: Class = Class.forClassType(this._primaryClass);
+//   private createContext(): ApplicationContext {
+//     let clazz: Class = Class.forClassType(this._primaryClass);
 
-    let ans = TypeUtil.ancestorsOf(this._primaryClass);
 
-    let wa: WebApplicationAnnotation = clazz.getOwnAnnotation(WebApplicationAnnotation);
-    if (undefined === wa) {
-      throw new Error(`Class is not WebApplication type. add @WebApplication annotation to class[${this._primaryClass.name}]`);
-    }
-    this._applicationContext = new ApplicationContext(wa.attributes.injectables);
+//     let wa: WebApplicationAnnotation = clazz.getOwnAnnotation(WebApplicationAnnotation);
+//     if (undefined === wa) {
+//       throw new Error(`Class is not WebApplication type. add @WebApplication annotation to class[${this._primaryClass.name}]`);
+//     }
+//     this._applicationContext = new ApplicationContext(wa.attributes.injectables);
 
-    this.registerJSONSources(wa.attributes.jsonSources);
-    this.registerConfigurations(wa.attributes.configurations);
+//     this.registerJSONSources(wa.attributes.jsonSources);
+//     this.registerConfigurations(wa.attributes.configurations);
 
-    return this._applicationContext;
-  }
+//     return this._applicationContext;
+//   }
 
-  private registerJSONSources(jsonSources: any[]): void {
-    if (undefined === jsonSources || null === jsonSources) {
-      return;
-    }
-    let instanceFactory = this._applicationContext.instanceFactory;
-    let jsons = Object.assign({}, ...jsonSources);
-    instanceFactory.registerJSON(jsons);
-  }
+//   private registerJSONSources(jsonSources: any[]): void {
+//     if (undefined === jsonSources || null === jsonSources) {
+//       return;
+//     }
+//     let instanceFactory = this._applicationContext.instanceFactory;
+//     let jsons = Object.assign({}, ...jsonSources);
+//     instanceFactory.registerJSON(jsons);
+//   }
 
-  private registerConfigurations(configurationTypes: ClassType[]): void {
-    if (undefined === configurationTypes || null === configurationTypes) {
-      return;
-    }
-    let instanceFactory = this._applicationContext.instanceFactory;
+//   private registerConfigurations(configurationTypes: ClassType[]): void {
+//     if (undefined === configurationTypes || null === configurationTypes) {
+//       return;
+//     }
+//     let instanceFactory = this._applicationContext.instanceFactory;
 
-    configurationTypes.forEach(configurationType => {
-      let clazz: Class = Class.forClassType(configurationType);
-      let configAnnotation: ConfigurationAnnotation = clazz.getOwnAnnotation(ConfigurationAnnotation);
-      if (undefined === configAnnotation) {
-        throw new Error(`Class is not Configuration type. add @Configuration annotation to class[${configurationType.name}]`);
-      }
-      let methods = clazz.getOwnMethods();
-      if (null === methods) {
-        return;
-      }
-      let instance = clazz.getConstructor().newInstance();
-      instanceFactory.applyInstance(configurationType, instance);
-      methods.forEach(method => {
-        let instanceAnnotation = method.getOwnAnnotation(InstanceAnnotation);
-        if (undefined === instanceAnnotation) {
-          return;
-        }
-        let singletonName = null === instanceAnnotation.attributes.name ? method.getName() : instanceAnnotation.attributes.name;
-        let result = method.invoke(instance);
-        instanceFactory.registerSingleton(singletonName, method.getReturnType(), result);
-      });
-    });
-  }
+//     configurationTypes.forEach(configurationType => {
+//       let clazz: Class = Class.forClassType(configurationType);
+//       let configAnnotation: ConfigurationAnnotation = clazz.getOwnAnnotation(ConfigurationAnnotation);
+//       if (undefined === configAnnotation) {
+//         throw new Error(`Class is not Configuration type. add @Configuration annotation to class[${configurationType.name}]`);
+//       }
+//       let methods = clazz.getOwnMethods();
+//       if (null === methods) {
+//         return;
+//       }
+//       let instance = clazz.getConstructor().newInstance();
+//       instanceFactory.applyInstance(configurationType, instance);
+//       methods.forEach(method => {
+//         let instanceAnnotation = method.getOwnAnnotation(InstanceAnnotation);
+//         if (undefined === instanceAnnotation) {
+//           return;
+//         }
+//         let singletonName = null === instanceAnnotation.attributes.name ? method.getName() : instanceAnnotation.attributes.name;
+//         let result = method.invoke(instance);
+//         instanceFactory.registerSingleton(singletonName, method.getReturnType(), result);
+//       });
+//     });
+//   }
 }
diff --git a/src/ts/@overflow/commons/application/context/__application_context.ts b/src/ts/@overflow/commons/application/context/__application_context.ts
deleted file mode 100644
index 0545816..0000000
--- a/src/ts/@overflow/commons/application/context/__application_context.ts
+++ /dev/null
@@ -1,46 +0,0 @@
-import {
-  ClassType,
-} from '@overflow/commons/core/type';
-
-import {
-  Class,
-} from '@overflow/commons/core/reflect';
-
-import {
-  InstanceDefinition,
-  InstanceFactory,
-} from '@overflow/commons/di/factory';
-
-import { InstanceDefinitionReader } from './instance_definition_reader';
-
-export class ApplicationContext {
-  private _instanceFactory: InstanceFactory;
-  private _instanceDefinitionReader: InstanceDefinitionReader;
-
-  public constructor(injectables: ClassType[]) {
-    this._instanceFactory = new InstanceFactory();
-    this._instanceDefinitionReader = new InstanceDefinitionReader();
-
-    this.initializeInjectables(injectables);
-  }
-
-  private initializeInjectables(injectables: ClassType[]): void {
-    if (undefined === injectables) {
-      return;
-    }
-    injectables.forEach(injectable => {
-      let name = injectable.name;
-      let definition: InstanceDefinition = new InstanceDefinition(injectable);
-      this._instanceFactory.registerInstanceDefinition(name, definition);
-    });
-  }
-
-  /**
-   * instanceFactory
-   */
-  public get instanceFactory(): InstanceFactory {
-    return this._instanceFactory;
-  }
-
-
-}
diff --git a/src/ts/@overflow/commons/application/context/application_context.ts b/src/ts/@overflow/commons/application/context/application_context.ts
index 5285d7e..e6e97de 100644
--- a/src/ts/@overflow/commons/application/context/application_context.ts
+++ b/src/ts/@overflow/commons/application/context/application_context.ts
@@ -1,3 +1,7 @@
+import {
+  ClassType,
+} from '@overflow/commons/core/type';
+
 import {
   InstanceFactory,
 } from '@overflow/commons/di/factory';
@@ -10,66 +14,52 @@ import { InstanceDefinitionReader } from './instance_definition_reader';
 export class ApplicationContext {
   public static readonly MESSAGE_SOURCE_INSTANCE_NAME: string = 'messageSource';
 
-  private readonly instanceFactoryPostProcessors: InstanceFactoryPostProcessor[] = [];
-
-  private id: ApplicationContextIDType;
-  private parent: ApplicationContext;
-  private messageSource: MessageSource;
-  private instanceFactory: InstanceFactory;
-  private instanceDefinitionReader: InstanceDefinitionReader;
+  private _id: ApplicationContextIDType;
+  private _parent: ApplicationContext;
+  private _messageSource: MessageSource;
+  private _instanceFactory: InstanceFactory;
+  private _instanceDefinitionReader: InstanceDefinitionReader;
 
   public constructor(parent?: ApplicationContext) {
-    this.setParent(parent);
+    this.parent = parent;
+    this._instanceFactory = new InstanceFactory();
+    this._instanceDefinitionReader = new InstanceDefinitionReader(this._instanceFactory.instanceDefinitionRegistry);
   }
 
+
   // Context
 
-  public getID(): ApplicationContextIDType {
+  public get id(): ApplicationContextIDType {
     return this.id;
   }
-  public setID(id: ApplicationContextIDType): void {
+  public set id(id: ApplicationContextIDType) {
     this.id = id;
   }
 
-  public getApplicationName(): string {
+  public get applicationName(): string {
     return undefined;
   }
 
-  public getParent(): ApplicationContext {
-    return this.parent;
+  public get parent(): ApplicationContext {
+    return this._parent;
   }
-  public setParent(parent: ApplicationContext): void {
-    this.parent = parent;
+  public set parent(parent: ApplicationContext) {
+    this._parent = parent;
   }
 
-  public getInstanceFactory(): InstanceFactory {
-    return undefined;
+  public get instanceFactory(): InstanceFactory {
+    return this._instanceFactory;
+  }
+
+  public get instanceDefinitionReader(): InstanceDefinitionReader {
+    return this._instanceDefinitionReader;
   }
 
   // Configuration
 
-  public addInstanceFactoryPostProcessor(instanceFactoryPostProcessor: InstanceFactoryPostProcessor): void {
-    this.instanceFactoryPostProcessors.push(instanceFactoryPostProcessor);
-  }
-  public getInstanceFactoryPostProcessor(): InstanceFactoryPostProcessor[] {
-    return this.instanceFactoryPostProcessors;
-  }
-
-  public addApplicationListener(listener: ApplicationListener): void {
-    //
-  }
-
-  public registerShutdownHook(): void {
-    //
-  }
-
-  public initMessageSource(): void {
-    //
-  }
-
   // MessageSource
-  public getMessageSource(): MessageSource {
-    return this.messageSource;
+  public get messageSource(): MessageSource {
+    return this._messageSource;
   }
 
   // Lifecycle
diff --git a/src/ts/@overflow/commons/application/context/index.ts b/src/ts/@overflow/commons/application/context/index.ts
index 1c19132..a265c0f 100644
--- a/src/ts/@overflow/commons/application/context/index.ts
+++ b/src/ts/@overflow/commons/application/context/index.ts
@@ -1,2 +1,4 @@
 export * from './application_context';
 export * from './instance_definition_reader';
+export * from './scope_metadata';
+export * from './scope_metadata_resolver';
diff --git a/src/ts/@overflow/commons/application/context/instance_definition_reader.ts b/src/ts/@overflow/commons/application/context/instance_definition_reader.ts
index 841be84..3ca6992 100644
--- a/src/ts/@overflow/commons/application/context/instance_definition_reader.ts
+++ b/src/ts/@overflow/commons/application/context/instance_definition_reader.ts
@@ -2,30 +2,63 @@ import {
   ClassType,
 } from '@overflow/commons/core/type';
 
-import { Assert } from '@overflow/commons/core/util';
+import { Annotation } from '@overflow/commons/core/reflect';
+
+import {
+  Assert,
+  AnnotationUtils,
+} from '@overflow/commons/core/util';
 
 import {
-  InstanceDefinitionRegistry, InstanceNameGenerator,
   InstanceDefinition,
+  InstanceDefinitionRegistry,
+  InstanceNameGenerator,
 } from '@overflow/commons/di/factory';
 
+import {
+  InstanceNameType,
+  NotInjectableError,
+} from '@overflow/commons/di/type';
+
+import { ScopeMetadataResolver } from './scope_metadata_resolver';
+import { InjectableAnnotation, QualifierAnnotation } from '@overflow/commons/di/decorators';
+
 
 export class InstanceDefinitionReader {
   private instanceDefinitionRegistry: InstanceDefinitionRegistry;
-  private instanceNameGenerator: InstanceNameGenerator;
+  private instanceNameGenerator: InstanceNameGenerator = new InstanceNameGenerator();
+  private scopeMetadataResolver: ScopeMetadataResolver = new ScopeMetadataResolver();
 
   public constructor(registry: InstanceDefinitionRegistry) {
     Assert.notNull(registry, 'InstanceDefinitionRegistry must not be null');
     this.instanceDefinitionRegistry = registry;
   }
 
-  public register(...injectables: ClassType[]): void {
+  public registerInjectables(...injectables: ClassType[]): void {
     injectables.forEach(injectable => {
-      this.registerInstance(injectable);
+      this.registerInjectable(injectable, undefined);
     });
   }
 
-  public registerInstance(injectable: ClassType): void {
-    let instanceDefinition: InstanceDefinition = new InstanceDefinition(injectable);
+  public registerInjectable(injectable: ClassType, name: InstanceNameType | undefined, ...qualifiers: QualifierAnnotation[]): void {
+    if (!AnnotationUtils.hasAnnotation(injectable, InjectableAnnotation)) {
+      throw new NotInjectableError();
+    }
+
+    let definition: InstanceDefinition = new InstanceDefinition(injectable);
+    let scopeMeta = this.scopeMetadataResolver.resolveScopeMetadata(definition);
+    definition.scope = scopeMeta.scope;
+    let instanceName =
+                      undefined !== name
+                      ? name
+                      : this.instanceNameGenerator.generateInstanceName(definition, this.instanceDefinitionRegistry);
+
+    if (undefined !== qualifiers) {
+      qualifiers.forEach(qualifier => {
+        definition.addQualifier(qualifier);
+      });
+    }
+
+    this.instanceDefinitionRegistry.registerInstanceDefinition(instanceName, definition);
   }
 }
diff --git a/src/ts/@overflow/commons/application/context/scope_metadata.ts b/src/ts/@overflow/commons/application/context/scope_metadata.ts
new file mode 100644
index 0000000..67674ee
--- /dev/null
+++ b/src/ts/@overflow/commons/application/context/scope_metadata.ts
@@ -0,0 +1,13 @@
+import { ScopeType } from '@overflow/commons/di/type';
+
+export class ScopeMetadata {
+  private _scope: ScopeType = ScopeType.Singleton;
+
+  public get scope(): ScopeType {
+    return this._scope;
+  }
+  public set scope(scope: ScopeType) {
+    this._scope = scope;
+  }
+
+}
diff --git a/src/ts/@overflow/commons/application/context/scope_metadata_resolver.ts b/src/ts/@overflow/commons/application/context/scope_metadata_resolver.ts
index 6be8ab2..82aa580 100644
--- a/src/ts/@overflow/commons/application/context/scope_metadata_resolver.ts
+++ b/src/ts/@overflow/commons/application/context/scope_metadata_resolver.ts
@@ -9,12 +9,14 @@ import {
 import { ScopeAnnotation } from '@overflow/commons/di/decorators';
 import { InstanceDefinition } from '@overflow/commons/di/factory';
 import { ScopeType } from '@overflow/commons/di/type';
+import { ScopeMetadata } from './scope_metadata';
 
 
 export class ScopeMetadataResolver {
   protected static scopeAnnotationType: ClassType<Annotation> = ScopeAnnotation;
 
-  public resolveScopeMetadata(definition: InstanceDefinition): ScopeType {
+  public resolveScopeMetadata(definition: InstanceDefinition): ScopeMetadata {
+    let scopeMetadata: ScopeMetadata = new ScopeMetadata();
     let scope: ScopeType = ScopeType.Default;
 
   }
diff --git a/src/ts/@overflow/commons/application/decorators/instance.ts b/src/ts/@overflow/commons/application/decorators/instance.ts
index 6191811..486f555 100644
--- a/src/ts/@overflow/commons/application/decorators/instance.ts
+++ b/src/ts/@overflow/commons/application/decorators/instance.ts
@@ -14,13 +14,15 @@ import {
 
 export interface InstanceAnnotationAttributes {
   name?: InstanceNameType;
+  initMethod?: Function;
+  destroyMethod?: Function;
 }
 
 export class InstanceAnnotation extends Annotation {
   public readonly attributes: InstanceAnnotationAttributes = {
   };
 
-  public constructor(name: InstanceNameType | InstanceNameType[] | InstanceAnnotationAttributes) {
+  public constructor(name: InstanceNameType | InstanceAnnotationAttributes) {
     super();
     if (undefined === name) {
       return;
diff --git a/src/ts/@overflow/commons/application/decorators/web_application.ts b/src/ts/@overflow/commons/application/decorators/web_application.ts
index d0b4ddb..988d0ef 100644
--- a/src/ts/@overflow/commons/application/decorators/web_application.ts
+++ b/src/ts/@overflow/commons/application/decorators/web_application.ts
@@ -8,12 +8,15 @@ import {
   PropertyKeyType,
 } from '@overflow/commons/core/type';
 
+import { Configuration } from './configuration';
+
 export interface WebApplicationAnnotationAttributes {
   jsonSources?: any[];
   injectables?: ClassType[];
   configurations?: ClassType[];
 }
 
+@Configuration()
 export class WebApplicationAnnotation extends Annotation {
   public readonly attributes: WebApplicationAnnotationAttributes = {
   };
diff --git a/src/ts/@overflow/commons/core/util/annotation.ts b/src/ts/@overflow/commons/core/util/annotation.ts
new file mode 100644
index 0000000..1d04bbe
--- /dev/null
+++ b/src/ts/@overflow/commons/core/util/annotation.ts
@@ -0,0 +1,36 @@
+import { Class, Annotation } from '@overflow/commons/core/reflect';
+import { ClassType } from '@overflow/commons/core/type';
+
+export abstract class AnnotationUtils {
+  public static hasAnnotation<T extends Annotation>(classType: ClassType, annotationClass: ClassType<T>): boolean {
+    let annotation = AnnotationUtils.getAnnotation(classType, annotationClass);
+    if (undefined !== annotation) {
+      return true;
+    }
+    return false;
+  }
+
+  public static getAnnotation<T extends Annotation>(classType: ClassType, annotationClass: ClassType<T>): T | undefined {
+    let clazz = Class.forClassType(classType);
+    if (undefined === clazz) {
+      return undefined;
+    }
+
+    let annotations = clazz.getAnnotations();
+    if (0 === annotations.size) {
+      return undefined;
+    }
+
+    for (const annonClassType of Array.from(annotations.keys())) {
+      if (annonClassType === annotationClass) {
+        return <T>annotations.get(annonClassType);
+      }
+      let annotation = AnnotationUtils.getAnnotation(annonClassType, annotationClass);
+      if (undefined !== annotation) {
+        return annotation;
+      }
+    }
+
+    return undefined;
+  }
+}
diff --git a/src/ts/@overflow/commons/core/util/assert.ts b/src/ts/@overflow/commons/core/util/assert.ts
index 075abe2..efef2ab 100644
--- a/src/ts/@overflow/commons/core/util/assert.ts
+++ b/src/ts/@overflow/commons/core/util/assert.ts
@@ -1,5 +1,5 @@
 import { IllegalArgumentError } from '../type/error';
-import { StringUtil, StringUtils } from './string';
+import { StringUtils } from './string';
 
 
 
diff --git a/src/ts/@overflow/commons/core/util/index.ts b/src/ts/@overflow/commons/core/util/index.ts
index d253650..788cdbf 100644
--- a/src/ts/@overflow/commons/core/util/index.ts
+++ b/src/ts/@overflow/commons/core/util/index.ts
@@ -1,3 +1,4 @@
+export * from './annotation';
 export * from './assert';
 export * from './locale';
 export * from './registry';
diff --git a/src/ts/@overflow/commons/di/decorators/index.ts b/src/ts/@overflow/commons/di/decorators/index.ts
index 9fb9d18..11ed455 100644
--- a/src/ts/@overflow/commons/di/decorators/index.ts
+++ b/src/ts/@overflow/commons/di/decorators/index.ts
@@ -1,6 +1,5 @@
 export * from './inject';
 export * from './injectable';
-export * from './named';
 export * from './post_construct';
 export * from './pre_destroy';
 export * from './qualifier';
diff --git a/src/ts/@overflow/commons/di/decorators/inject.ts b/src/ts/@overflow/commons/di/decorators/inject.ts
index bf5b2b5..9c8b04a 100644
--- a/src/ts/@overflow/commons/di/decorators/inject.ts
+++ b/src/ts/@overflow/commons/di/decorators/inject.ts
@@ -13,25 +13,25 @@ import {
 } from '@overflow/commons/di/type';
 
 export interface InjectAnnotationAttributes {
-  name?: InstanceNameType;
+  required?: boolean;
 }
 
 export class InjectAnnotation extends Annotation {
   public readonly attributes: InjectAnnotationAttributes = {
-
+    required: true,
   };
 
-  public constructor(name: InstanceNameType | InjectAnnotationAttributes) {
+  public constructor(required?: boolean | InjectAnnotationAttributes) {
     super();
 
-    if (undefined === name) {
+    if (undefined === required) {
       return;
     }
 
-    if (TypeUtil.isString(name)) {
-      this.attributes.name = <InstanceNameType>name;
+    if (TypeUtil.isBoolean(required)) {
+      this.attributes.required = <boolean>required;
     } else {
-      this.copyAttributes(this.attributes, <InjectAnnotationAttributes>name);
+      this.copyAttributes(this.attributes, <InjectAnnotationAttributes>required);
     }
   }
 
diff --git a/src/ts/@overflow/commons/di/decorators/injectable.ts b/src/ts/@overflow/commons/di/decorators/injectable.ts
index 4eac262..e061eda 100644
--- a/src/ts/@overflow/commons/di/decorators/injectable.ts
+++ b/src/ts/@overflow/commons/di/decorators/injectable.ts
@@ -13,24 +13,22 @@ import {
 } from '@overflow/commons/di/type';
 
 export interface InjectableAnnotationAttributes {
-  name?: InstanceNameType[];
+  name?: InstanceNameType;
 }
 
 export class InjectableAnnotation extends Annotation {
   public readonly attributes: InjectableAnnotationAttributes = {
-
+    name: undefined,
   };
 
-  public constructor(name: InstanceNameType | InstanceNameType[] | InjectableAnnotationAttributes) {
+  public constructor(name?: InstanceNameType | InjectableAnnotationAttributes) {
     super();
     if (undefined === name) {
       return;
     }
 
     if (TypeUtil.isString(name)) {
-      this.attributes.name = [<InstanceNameType>name];
-    } else if (TypeUtil.isArray(name)) {
-      this.attributes.name = <InstanceNameType[]>name;
+      this.attributes.name = <InstanceNameType>name;
     } else {
       this.copyAttributes(this.attributes, <InjectableAnnotationAttributes>name);
     }
@@ -40,11 +38,6 @@ export class InjectableAnnotation extends Annotation {
     console.log('Injectable');
   }
 
-  public methodDecorator<T>(target: Object, propertyKey: PropertyKeyType,
-                            descriptor: TypedPropertyDescriptor<T>): TypedPropertyDescriptor<T> | void {
-    console.log('Injectable');
-  }
-
 }
 
 export const Injectable = Decorator.create(InjectableAnnotation);
diff --git a/src/ts/@overflow/commons/di/decorators/named.ts b/src/ts/@overflow/commons/di/decorators/named.ts
deleted file mode 100644
index e69de29..0000000
diff --git a/src/ts/@overflow/commons/di/decorators/post_construct.ts b/src/ts/@overflow/commons/di/decorators/post_construct.ts
index 4f4f464..3d5a96e 100644
--- a/src/ts/@overflow/commons/di/decorators/post_construct.ts
+++ b/src/ts/@overflow/commons/di/decorators/post_construct.ts
@@ -9,25 +9,14 @@ import {
 } from '@overflow/commons/core/type';
 
 export interface PostConstructAnnotationAttributes {
-  name?: string[];
 }
 
 export class PostConstructAnnotation extends Annotation {
   public readonly attributes: PostConstructAnnotationAttributes = {
-
   };
 
-  public constructor(name: string | string[] | PostConstructAnnotationAttributes) {
+  public constructor() {
     super();
-    if (undefined === name) {
-      return;
-    }
-
-    if (TypeUtil.isString(name)) {
-      this.attributes.name = [<string>name];
-    } else {
-      this.copyAttributes(this.attributes, <PostConstructAnnotationAttributes>name);
-    }
   }
 
   public methodDecorator<T>(target: Object, propertyKey: PropertyKeyType,
diff --git a/src/ts/@overflow/commons/di/decorators/pre_destroy.ts b/src/ts/@overflow/commons/di/decorators/pre_destroy.ts
index 7ce453c..37ab461 100644
--- a/src/ts/@overflow/commons/di/decorators/pre_destroy.ts
+++ b/src/ts/@overflow/commons/di/decorators/pre_destroy.ts
@@ -9,7 +9,6 @@ import {
 } from '@overflow/commons/core/type';
 
 export interface PreDestroyAnnotationAttributes {
-  name?: string[];
 }
 
 export class PreDestroyAnnotation extends Annotation {
@@ -17,17 +16,8 @@ export class PreDestroyAnnotation extends Annotation {
 
   };
 
-  public constructor(name: string | string[] | PreDestroyAnnotationAttributes) {
+  public constructor() {
     super();
-    if (undefined === name) {
-      return;
-    }
-
-    if (TypeUtil.isString(name)) {
-      this.attributes.name = [<string>name];
-    } else {
-      this.copyAttributes(this.attributes, <PreDestroyAnnotationAttributes>name);
-    }
   }
 
   public methodDecorator<T>(target: Object, propertyKey: PropertyKeyType,
diff --git a/src/ts/@overflow/commons/di/decorators/qualifier.ts b/src/ts/@overflow/commons/di/decorators/qualifier.ts
index e69de29..a21b8b0 100644
--- a/src/ts/@overflow/commons/di/decorators/qualifier.ts
+++ b/src/ts/@overflow/commons/di/decorators/qualifier.ts
@@ -0,0 +1,55 @@
+import {
+  Annotation,
+  Decorator,
+} from '@overflow/commons/core/reflect';
+
+import {
+  PropertyKeyType,
+  TypeUtil,
+} from '@overflow/commons/core/type';
+
+import {
+  InstanceNameType,
+} from '@overflow/commons/di/type';
+
+export interface QualifierAnnotationAttributes {
+  name?: InstanceNameType;
+}
+
+export class QualifierAnnotation extends Annotation {
+  public readonly attributes: QualifierAnnotationAttributes = {
+    name: '',
+  };
+
+  public constructor(name: InstanceNameType | QualifierAnnotationAttributes) {
+    super();
+    if (undefined === name) {
+      return;
+    }
+
+    if (TypeUtil.isString(name)) {
+      this.attributes.name = <InstanceNameType>name;
+    } else {
+      this.copyAttributes(this.attributes, <QualifierAnnotationAttributes>name);
+    }
+  }
+
+  public classDecorator<TFunction extends Function>(target: TFunction): TFunction | void {
+    console.log('Qualifier');
+  }
+
+  public propertyDecorator(target: Object, propertyKey: PropertyKeyType): void {
+    console.log('Qualifier');
+  }
+
+  public methodDecorator<T>(target: Object, propertyKey: PropertyKeyType,
+                            descriptor: TypedPropertyDescriptor<T>): TypedPropertyDescriptor<T> | void {
+    console.log('Qualifier');
+  }
+
+  public parameterDecorator(target: Object, propertyKey: PropertyKeyType, parameterIndex: number): void {
+    console.log('Qualifier');
+  }
+}
+
+export const Qualifier = Decorator.create(QualifierAnnotation);
diff --git a/src/ts/@overflow/commons/di/decorators/resource.ts b/src/ts/@overflow/commons/di/decorators/resource.ts
index b0fadc0..a5b2b46 100644
--- a/src/ts/@overflow/commons/di/decorators/resource.ts
+++ b/src/ts/@overflow/commons/di/decorators/resource.ts
@@ -46,10 +46,6 @@ export class ResourceAnnotation extends Annotation {
                             descriptor: TypedPropertyDescriptor<T>): TypedPropertyDescriptor<T> | void {
     console.log('Resource');
   }
-
-  public parameterDecorator(target: Object, propertyKey: PropertyKeyType, parameterIndex: number): void {
-    console.log('Resource');
-  }
 }
 
 export const Resource = Decorator.create(ResourceAnnotation);
diff --git a/src/ts/@overflow/commons/di/decorators/scope.ts b/src/ts/@overflow/commons/di/decorators/scope.ts
index a87ddd1..d52cddb 100644
--- a/src/ts/@overflow/commons/di/decorators/scope.ts
+++ b/src/ts/@overflow/commons/di/decorators/scope.ts
@@ -14,21 +14,21 @@ import {
 } from '@overflow/commons/di/type';
 
 export interface ScopeAnnotationAttributes {
-  value?: ScopeType;
+  scope?: ScopeType;
 }
 
 export class ScopeAnnotation extends Annotation {
   public readonly attributes: ScopeAnnotationAttributes = {
-    value: ScopeType.Default,
+    scope: ScopeType.Default,
   };
 
-  public constructor(value: ScopeType | ScopeAnnotationAttributes) {
+  public constructor(scope: ScopeType | ScopeAnnotationAttributes) {
     super();
 
-    if (undefined !== (<ScopeAnnotationAttributes>value).value) {
-      this.copyAttributes(this.attributes, <ScopeAnnotationAttributes>value);
+    if (undefined !== (<ScopeAnnotationAttributes>scope).scope) {
+      this.copyAttributes(this.attributes, <ScopeAnnotationAttributes>scope);
     } else {
-      this.attributes.value = value;
+      this.attributes.scope = <ScopeType>scope;
     }
   }
 
diff --git a/src/ts/@overflow/commons/di/decorators/value.ts b/src/ts/@overflow/commons/di/decorators/value.ts
index 78d5a0f..ba28736 100644
--- a/src/ts/@overflow/commons/di/decorators/value.ts
+++ b/src/ts/@overflow/commons/di/decorators/value.ts
@@ -34,6 +34,11 @@ export class ValueAnnotation extends Annotation {
     console.log('Value');
   }
 
+  public methodDecorator<T>(target: Object, propertyKey: PropertyKeyType,
+                            descriptor: TypedPropertyDescriptor<T>): TypedPropertyDescriptor<T> | void {
+    console.log('Value');
+  }
+
   public parameterDecorator(target: Object, propertyKey: PropertyKeyType, parameterIndex: number): void {
     console.log('Value');
   }
diff --git a/src/ts/@overflow/commons/di/factory/__instance_definition.ts b/src/ts/@overflow/commons/di/factory/__instance_definition
similarity index 100%
rename from src/ts/@overflow/commons/di/factory/__instance_definition.ts
rename to src/ts/@overflow/commons/di/factory/__instance_definition
diff --git a/src/ts/@overflow/commons/di/factory/__instance_factory.ts b/src/ts/@overflow/commons/di/factory/__instance_factory
similarity index 100%
rename from src/ts/@overflow/commons/di/factory/__instance_factory.ts
rename to src/ts/@overflow/commons/di/factory/__instance_factory
diff --git a/src/ts/@overflow/commons/di/factory/index.ts b/src/ts/@overflow/commons/di/factory/index.ts
index 94c42ed..620fe06 100644
--- a/src/ts/@overflow/commons/di/factory/index.ts
+++ b/src/ts/@overflow/commons/di/factory/index.ts
@@ -2,3 +2,4 @@ export * from './instance_definition_registry';
 export * from './instance_definition';
 export * from './instance_factory';
 export * from './instance_name_generator';
+export * from './singleton_instance_registry';
diff --git a/src/ts/@overflow/commons/di/factory/instance_definition.ts b/src/ts/@overflow/commons/di/factory/instance_definition.ts
index 16c8abb..4246b68 100644
--- a/src/ts/@overflow/commons/di/factory/instance_definition.ts
+++ b/src/ts/@overflow/commons/di/factory/instance_definition.ts
@@ -1,39 +1,41 @@
+import {
+  Class,
+} from '@overflow/commons/core/reflect';
+
+import {
+  ClassType,
+} from '@overflow/commons/core/type';
+
 import { Assert } from '@overflow/commons/core/util';
-import { ScopeType, InjectModeType } from '@overflow/commons/di/type';
+
+import {
+  QualifierAnnotation,
+} from '@overflow/commons/di/decorators';
+
+import {
+  ScopeType,
+  InjectModeType,
+  NotInjectableError,
+} from '@overflow/commons/di/type';
 
 export class InstanceDefinition {
   private readonly attributes: Map<string, any> = new Map();
-  private scope: ScopeType = ScopeType.Default;
-  private injectMode: InjectModeType = InjectModeType.No;
+  private _instanceClass: Class;
+  private _scope: ScopeType = ScopeType.Default;
+  private _injectMode: InjectModeType = InjectModeType.No;
 
-  // Attributes
 
-  public setAttribute(name: string, value?: any): void {
-    Assert.notNull(name, 'Name must not be null');
-    if (value !== undefined) {
-      this.attributes.set(name, value);
-    } else {
-      this.removeAttribute(name);
+  public constructor(instanceClassType: ClassType) {
+    let clazz = Class.forClassType(instanceClassType);
+    if (undefined === clazz) {
+      throw new NotInjectableError();
     }
+
+    this._instanceClass = clazz;
   }
 
-  public getAttribute(name: string): any | undefined {
-    Assert.notNull(name, 'Name must not be null');
-    return this.attributes.get(name);
-  }
-
-  public removeAttribute(name: string): boolean {
-    Assert.notNull(name, 'Name must not be null');
-    return this.attributes.delete(name);
-  }
-
-  public hasAttribute(name: string): boolean {
-    Assert.notNull(name, 'Name must not be null');
-    return this.attributes.has(name);
-  }
-
-  public attributeNames(): IterableIterator<string> {
-    return this.attributes.keys();
+  public get instanceClass(): Class {
+    return this._instanceClass;
   }
 
   // Metadata
@@ -41,14 +43,22 @@ export class InstanceDefinition {
     return undefined;
   }
 
-  public setScope(scope: ScopeType): void {
+  public set scope(scope: ScopeType) {
     this.scope = scope;
   }
 
-  public getScope(): ScopeType {
+  public get scope(): ScopeType {
     return this.scope;
   }
 
+  public get injectMode(): InjectModeType {
+    return this._injectMode;
+  }
+
+  public set injectMode(injectMode: InjectModeType) {
+    this._injectMode = injectMode;
+  }
+
   public isSingleton(): boolean {
     return ScopeType.Singleton === this.scope || ScopeType.Default === this.scope;
   }
@@ -57,12 +67,7 @@ export class InstanceDefinition {
     return ScopeType.Transiant === this.scope;
   }
 
-  public setInjectMode(injectMode: InjectModeType): void {
-    this.injectMode = injectMode;
+  public addQualifier(qualifier: QualifierAnnotation): void {
+    //
   }
-
-  public getInjectMode(): InjectModeType {
-    return this.injectMode;
-  }
-
 }
diff --git a/src/ts/@overflow/commons/di/factory/instance_factory.ts b/src/ts/@overflow/commons/di/factory/instance_factory.ts
index 7f8d92c..24e46d8 100644
--- a/src/ts/@overflow/commons/di/factory/instance_factory.ts
+++ b/src/ts/@overflow/commons/di/factory/instance_factory.ts
@@ -7,7 +7,7 @@ import {
 } from '@overflow/commons/core/type';
 
 import {
-  InjectType,
+  InjectModeType,
   InstanceNameType,
 } from '@overflow/commons/di/type';
 
@@ -15,9 +15,13 @@ import { InstanceDefinition } from './instance_definition';
 import { InstanceDefinitionRegistry } from './instance_definition_registry';
 
 export class InstanceFactory {
-  private instanceDefinitionRegistry: InstanceDefinitionRegistry;
+  private _instanceDefinitionRegistry: InstanceDefinitionRegistry;
 
 
+  public get instanceDefinitionRegistry(): InstanceDefinitionRegistry {
+    return this._instanceDefinitionRegistry;
+  }
+
   // Instance
 
   public getInstance(name: InstanceNameType | undefined, requiredType: ClassType | undefined, ...args: any[]): any | undefined {
@@ -44,7 +48,7 @@ export class InstanceFactory {
 
   // Create Instance
 
-  public createInstance<T>(clazzType: ClassType<T>, injectMode?: InjectType, dependencyCheck?: boolean): T {
+  public createInstance<T>(clazzType: ClassType<T>, injectMode?: InjectModeType, dependencyCheck?: boolean): T {
     return undefined;
   }
 
@@ -52,11 +56,11 @@ export class InstanceFactory {
     //
   }
 
-  public inject(clazzType: ClassType, injectMode?: InjectType, dependencyCheck?: boolean): any {
+  public inject(clazzType: ClassType, injectMode?: InjectModeType, dependencyCheck?: boolean): any {
     //
   }
 
-  public injectInstanceProperties(instance: any, injectMode: InjectType, dependencyCheck: boolean): void {
+  public injectInstanceProperties(instance: any, injectMode: InjectModeType, dependencyCheck: boolean): void {
     //
   }
 
diff --git a/src/ts/@overflow/commons/di/type/error.ts b/src/ts/@overflow/commons/di/type/error.ts
index 1ade987..689fc10 100644
--- a/src/ts/@overflow/commons/di/type/error.ts
+++ b/src/ts/@overflow/commons/di/type/error.ts
@@ -5,6 +5,13 @@ export class InstanceError extends Error {
   }
 }
 
+export class NotInjectableError extends InstanceError {
+  public constructor(message?: string) {
+    super(message);
+    Object.setPrototypeOf(this, new.target.prototype);
+  }
+}
+
 export class NoSuchInstanceDefinitionError extends InstanceError {
   public constructor(message?: string) {
     super(message);