Lecture # 04 & 05 CS314 Introduction To Software Development Software Development Process (SDP) Instructor :Muhammad Janas khan 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 Plan Solution 3Abasyn University, Peshawar Campus

 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 4Abasyn University, Peshawar Campus

Phases and Activities in SDP Feasibility Report Design Document Tested Software 5Abasyn University, Peshawar Campus

 Abstraction of SDP  Specialization of Generalization in SDP  Different for different conditions and circumstances Concept of SDLC Model 6Abasyn University, Peshawar Campus

 Ad-hoc  Waterfall  V-Shape  Evolutionary  Throwaway Prototype  Exploratory  Iterative Enhancement  Spiral  Rapid Application Development  eXtreme Programming (XP) Types of SDLC Model 7Abasyn University, Peshawar Campus

 Advantages  Simple & Quick  Direct working  Result oriented Disadvantages –No planning, Do not suit to big projects –No Documentation, No tracing –Highly risky relying on expertise of team Ad-hoc SDLC Model 8Abasyn University, Peshawar Campus

 +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 Software Design & Detailed Design Unit Implementation & Unit Testing Integration & System Testing Installation & Operation Maintenance & Enhancement Waterfall SDLC Model 9Abasyn University, Peshawar Campus

Prototyping Model Abasyn University, Peshawar Campus10 Goals Functionality Evaluate Develop

Prototyping Model Abasyn University, Peshawar Campus11 +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 Abasyn University, Peshawar Campus12  Throw-away Prototyping  Evolutionary Prototyping

Throw-away Prototyping Abasyn University, Peshawar Campus13  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 Abasyn University, Peshawar Campus14  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 Abasyn University, Peshawar Campus15

Evolutionary Prototyping Phases Abasyn University, Peshawar Campus16

 +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 17Abasyn University, Peshawar Campus

 +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 Cycles of selecting reusable modules and Integration Testing Deployment Operation and Learning Maintenance RAD SDLC Model 18Abasyn University, Peshawar Campus

THANK YOU SO MUCH 19Abasyn University, Peshawar Campus