4 sdlc

PREPARED BY: MINAL MANIAR

PROCESS OVERVIEW

• Software Development Process provides a basis for the organized production of software, using a collection of predefined techniques and notations.

• There are various software development approaches defined and designed which are used/employed during development process of software, these approaches are also referred as “Software Development Process Models” (e.g. Waterfall model, incremental model, V-model, iterative model, etc.).

• Each process model follows a particular life cycle in order to ensure success in process of software development.

• Software life cycle models describe phases of the software cycle and the order in which those phases are executed. Each phase produces deliverables required by the next phase in the life cycle.

SOFTWARE DEVELOPMENT LIFE CYCLE (SDLC) PHASES

• There are following eight phases in every Software Development Life Cycle model:

• System Conception

• Requirement gathering and analysis

• System Design

• Class Design

• Implementation or coding

• Testing

• Deployment

• Maintenance

SOFTWARE DEVELOPMENT LIFE CYCLE (SDLC) PHASES

• There are following eight phases in every Software Development Life Cycle model:

• System Conception deals with the genesis of an application, somebody thinks of an idea for an application, prepares business case and sells idea to the organization after understanding business needs and technological capabilities.

• Requirement gathering and analysis Analysts capture and scrutinize requirements by constructing models- what must be done , not how it should be done Developers consider the available sources of information and resolve ambiguities. There are two sub-stages of analysis: Domain Analysis and Application Analysis Domain Analysis focuses on real-world object Application Analysis emphasizes concepts and relationships. The job of constructing a domain model is mainly to decide which information to capture and how to represent it.

SOFTWARE DEVELOPMENT LIFE CYCLE (SDLC) PHASES

• System Design

During this phase developer makes strategic decisions with broad consequences. In this phase the system and software design is prepared from the requirement specifications which were studied in the first phase. System Design helps in specifying hardware and system requirements and also helps in defining overall system architecture. The system design specifications serve as input for the next phase of the model.

• Class Design During this phase developer expands and optimizes analysis models; shift from application concepts toward computer concepts. Developer choose algorithms to implement major system functions.

• Implementation or coding On receiving system design documents, the work is divided in

modules/units and actual coding is started. Since, in this phase the code is produced so it is the main focus for the developer. This is the longest phase of the software development life.

SOFTWARE DEVELOPMENT LIFE CYCLE (SDLC) PHASES

• Testing

After the code is developed it is tested against the requirements to make sure that the product is actually solving the needs addressed and gathered during the requirements phase. During this phase unit testing, integration testing, system testing, acceptance testing are done.

• Deployment After successful testing the product is delivered / deployed to the customer for their use.

• Maintenance

Once when the customers starts using the developed system then the actual problems comes up and needs to be solved from time to time. This process where the care is taken for the developed product is known as maintenance.

PREPARED BY: MINAL MANIAR

WHAT IS A DOMAIN MODEL?

• “A domain model captures the most important

types of objects in the context of the business. The

domain model represents the ‘things’ that exist or

events that transpire in the business environment.”

– I. Jacobsen

WHY DO A DOMAIN MODEL?

• Gives a conceptual framework of the things in the

problem space

• Helps you think – focus on semantics

• Provides a glossary of terms – noun based

• It is a static view - meaning it allows us convey

time invariant business rules

• Foundation for use case/workflow modelling

• Based on the defined structure, we can describe

the state of the problem domain at any time.

• What do you mean by Software Development Life

Cycle (SDLC)?

• What are the phases (stages) of it? Which phase

requires maximum efforts?

• Also explain why domain analysis is important.

ANALYSIS , DESIGN AND DOMAIN ANALYSIS: EXERCISE/ ASSIGNMENT