Aggregation-Object Oriented Analysis And Design-Lecture Slides, Slides of Object Oriented Analysis and Design

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Aggregation

Is-Part-of

Word Sentence

Composition

Whole-of

TitleBar Window

Dependencies vs. Associations

Associations are structural

Dependencies are non-structural

Association is visible relations referred by

global, static, local variable or obtained as

parameter.

Dependencies are transient links

Have limited duration

Meta

Instance-of

Class Instance CreationTool DrawingElement

Checkpoints

Operations

Easily understood operations State description is correct Required behavior is offered Parameters are defined correctly Messages are completely assigned operations Implementation specifications are correct Signatures confirm the standards (target language) All operations are needed by use case realizations (Remove not required and duplicate)

Checkpoints

Attributes

A single concept Descriptive names All attributes are needed by use case realizations (Remove if not required or duplicate)

Relationships

Descriptive role names Multiplicities are correct