Subject: Object Oriented Modeling and Design

Difficulty: Medium

Marks: 4 Marks

Object Modeling Technique (OMT) by Rambaugh includes four stage

1 Analysis: -

• Starting from a statement of the problem, the analyst builds a model of the real-world situation showing its important properties.

• The analyst works with the requestor to understand the problem statement.

• The analysis model is a concise, precise abstraction of what the desired system must do, not how it will be done

• A good model can be understood and criticized by application experts who are not programmers.

• The analysis model does not contain any implementation details.

2. System Design: -

• System designer makes high level decisions about the overall architecture.

• During system design, the target system is organized into subsystems based on both the analysis structure and the proposed architecture.

• The system designer decides what performance characteristics to optimize, choose a strategy of attacking the problem and make tentative resource allocations.

3. Object Design: -

• The object designer builds a design model based on the analysis model but contains implementation details.

• The designer adds details to the design model in accordance with the strategy established during system design.

• The focus of object design is the data structures and algorithms needed to implement each class.

4. Implementation: -

The objects, classes and relationships developed during object design are finally translated into a particular programming language, database or hardware implementation.