Lecture # 04 & 05 CS314 Introduction To Software Development

Software Development Process (SDP)

Instructor :Muhammad Janas khanjanas.khan@abasyn.edu.pk

Monday, September 17, 2014

Also called Software Development Life Cycle (SDLC)

SDP is the process of developing a software Starts with a need, gets mature to a plan and

ends with producing a software meeting the need

Software Development Process (SDP)

Need

Proposal

PlanSolution

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Formal Set of Guidelines Effective management control over technical

efforts Estimate Efforts and Schedule Has a defined plan of action Measurable for progress and performance Verifiable

Characteristics of Mature SDP

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Phases and Activities in SDP

Feasibility Report

Design Document

Tested Software

SO

FT

WA

RE

SRS

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Abstraction of SDP

Specialization of Generalization in SDP

Different for different conditions and circumstances

Concept of SDLC Model

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Ad-hoc Waterfall V-Shape Evolutionary Throwaway Prototype Exploratory Iterative Enhancement Spiral Rapid Application Development eXtreme Programming (XP)

Types of SDLC Model

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Advantages Simple & Quick Direct working Result oriented

BuildBuild

FixFix

• Disadvantages– No planning, Do not suit to big

projects– No Documentation, No tracing– Highly risky relying on expertise of

team

Ad-hoc SDLC Model

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+ve Linear & Simple Highly

documented and traceable

Formal closure of each step

-ve No looking back No iterations Long waiting to

product feel Low Customer

interaction

Requirement analysis

Requirement analysis

Software Design & Detailed

Design

Software Design & Detailed

Design

Unit Implementation &

Unit Testing

Unit Implementation &

Unit Testing

Integration & System TestingIntegration &

System Testing

Installation & Operation

Installation & Operation

Maintenance &

Enhancement

Maintenance &

Enhancement

Waterfall SDLC Model

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Prototyping Model

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Goals

Functionality Evaluate

Develop

Prototyping Model

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+ve users can try the system and provide constructive feedback during

development An operational prototype can be produced in weeks Users become more positive about implementing the system as

they see a solution emerging that will meet their needs Prototyping enables early detection of errors -ve Each iteration builds on the previous iteration and further refines

the solution. This makes it difficult to reject the initial solution as inappropriate and start over.

Formal end-of-phase reviews do not occur. Thus, its is very difficult to contain the scope of the prototype.

System documentation is often absent or incomplete, since the primary focus is on development of the prototype.

System backup and recovery, performance, and security issues can be overlooked.

Types of prototyping

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Throw-away Prototyping Evolutionary Prototyping

Throw-away Prototyping

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Throw Away Prototype is developed from the initial requirements but is not used for the final project.

Written specifications of the requirements

Some developers believe that this type is a waste of time because you don’t use it.

Regardless if prototype is discarded or kept for production, you must use a easy to use language.

Evolutionary Prototyping

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Evolutionary prototyping is consider the most fundamental form of prototyping.

Evolutionary prototyping main concept is to build a robust prototype and constantly improve it.

Objective to deliver a working system to the end user.

Evolutionary Prototyping

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Evolutionary Prototyping Phases

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Define the basic

requirements

Create a working

prototype

Verification of the working prototype

EvaluateAnd

Deliberate the

requirements

+ve Iterative Good Design Huge projects

accommodated Phase wise output Adds benefits of all

models -ve

Needs strong management

Needs strong Configuration management

Analysis

Project initiation

Delivery

Maintenance

Development

Spiral SDLC Model

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+ve Iterative Huge projects

accommodated Quick Delivery in minimum

time Best use of reusable off-the-

shelf components -ve

Result relies on availability of required reusable components

Quality of result depends on quality of components

Analyze &

Design

Analyze &

Design

Cycles of selecting reusable modules and Integration

TestingTesting

DeploymentDeployment

Operation and Learning

Operation and Learning

MaintenanceMaintenance

RAD SDLC Model

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THANK YOU SO MUCH

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