Lecture Slide 3 Software Dev Lifecycle

7/28/2019 Lecture Slide 3 Software Dev Lifecycle

1/11


2/11

@2011 AITI-KACE All Rights Reserved - Fundamentals of Programming 2

Objectives

Discuss various processes involve in the

development of software. Know the various professions at each stage of

developing software.


3/11


Terminologies

What is a program?

Set of instructions written in a specific programmingtechnology for a specific task.

What is a software?

A software is made up of a program, documentation of allprocess and manual for the use of the program.

What is Source Code:

Is the actual text written in a particular programming

language.

What is executable code:

executable code. Software in a form that can be run in thecomputer. It typically refers to machine language


4/11@2011 AITI-KACE All Rights Reserved - Fundamentals of Programming 4

Software Development Life Cycle

Set of activities and their relationships to each other to

support the development of a software system

ProblemIdentification

FeasibilityStudy

SystemAnalysis

Coding

Deployment &Maintenance

Testing (QualityAssurance)

SystemDesign


5/11


Feasibility Study

Feasibility study is a process that determines whether

a solution under analysis is achievable, given theorganization's resources and constraints.

The feasibility study examines seven areas: includingthose of a Needs Analysis, Economics, Technical,Schedule, Organizational, Cultural, and Legal.

If outcome of this face is positive then the softwareproject can be continued. If outcome is negative then

the entire project is halted.

Expert: Consultants


6/11


System Analysis

The problem is defined so that a clear understanding

can be gained of what the system should do: what the inputs to the system should be

what the output should be

establish the operational parameters within whichthe system is expected to work.

to replace an existing system, the problem may bedefined in terms of the additional or enhancedfunctionality that is required.

Expert: System Analyst


7/11


System Design

This phase a solution to the problem is

designed by defining a logical sequence ofsteps - algorithm(s). Some of the activitiesincludes:

breaking a given problem down into a series of

small tasks.

user interface is designed during this stage

determination of how input is obtained are made

determination of how output is displayed and whatcontrols are available to the user made.

documentation of the entire design process is done

Expert: Software Engineer


8/11


Implementation Stage

Activities includes:

translating of algorithms into a programminglanguages source code

tends to be the longest phase of the developmentlife-cycle.

documentation in the form of comment in thesource code are achieved here.

Expert: Programmer / Developer


9/11


Quality Assurance or Testing

Activities in this stage include:

technical reference to facilitate maintenance anddevelopment of the software itself.

user documentation is developed in this stage (i.e.a set of instructions for users about the features of

the software and how to use them). attempts are made to find any errors ("bugs") in the

program and eliminate those errors.

Expert: Quality Assurance Expert


10/11


Deployment phase

This is the phase where the system moves to

the client's environment. User training

Deployment Strategies

Parallel run Pilot run

Direct Change Over

The system is then deployed for the client.


11/11


Maintenance

The following are the activities which takes

place in this phase: Constant review of functionality to ensure thay work

well. Note that very system is not error free even.

More functional requirement are generated duringthe live time of the system to ensure continue useof system.

Lecture Slide 3 Software Dev Lifecycle

Documents

Transcript of Lecture Slide 3 Software Dev Lifecycle