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Chapter: Software Engineering - Requirements Analysis and Specification

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Classical Analysis

Specification document — Contract between client and developer Specifying what product must do and Constraints on product

Classical Analysis

 

Introduction

 

ü  The Specification Document

ü  Informal Specifications

ü  Structured Systems Analysis

ü  Structured Systems Analysis: The Art Dealer

ü  Other Semiformal Techniques

ü  Entity-Relationship Modeling

ü  Finite State Machines

ü  Petri Nets

 

ü  Z

 

ü  Other Formal Techniques

 

 

Specification document — Contract between client and developer Specifying what product must do and  Constraints on product

 To prove product satisfies its specifications

 


Almost always has a specified deadline for delivering product Incorporates constraints that product has to satisfy


 


Portability (e.g., hardware or operating system) Reliability (e.g., needed to be operational 24 hours a day)




A set of acceptance criteria  A series of tests


 

The Specification Document

 

Solution strategies — General approach to building theproduct Once development team fully understands the problem

 

Development team suggests solution strategies Determined if a solution satisfies client’s constraints

Record keeping of discarded solution for future justifications

 

One or more possible solution strategies are determined  Client has to make a two-stage decision

(1)Whether client should computerize: Cost-benefit analysis

(2)If so, which of viable solution strategies to adopt: Client’s optimization criterion

 

E.g., minimizing total cost to client

 

E.g., maximizing return on investment

 

Developers advise client as to which of the viable solution strategies best satisfies the optimization

 

 

Informal Specifications

Specification document could consist of many pages of text

English or other natural language

 

Client’s wishes may be ignored

 

There can be ambiguity

 

Style may not be good



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