Software Re-Engineering

B88901164 莫澤勇

What Is Software Engineering

Development of software systems whose size/complexity warrants a team or teams of engineers

Scope

study of software process, development and evolution principles, techniques and notations

Software Engineering

Goal

Production, modification and evolution of quality software, delivered on time, within budget, satisfying users’ needs

Software Life Cycles

1. 軟體的規格與系統的架構

2. 寫程式並且作個 Testing 的動作

3. 如何 Update

Software SpecificationAnd Design

ImplementationAnd Testing

Update & Maintenance

Software Life Cycles

Water Fall Model Spiral Model Evolutionary Model Incremental Model Rapid Prototyping

What is Waterfall Model

開發影音聊天室 – Water Fall App.

Waterfall Model

Advantage– it allows for departmentalization and managerial

control – Each phase of development proceeds in strict

order, without any overlapping or iterative steps. Disadvantage

– it does not allow for much reflection or revision Once an application is in the testing stage, it is very

difficult to go back and change something that was not well-thought out in the concept stage.

Software Evolution

Software which is used in a real- world environment must change or become less and less useful in that environment.

Techniques :– Forward Engineering

Redesign Specification

– Software Re-Engineering Reorganize Old System

Forward & Software Re-Engineering

Examples