Week 3 - Chapter 2: Software Development Life Cycle

Prelim module

Planning, Analysis, Design, Implementation (PADI)

The Systems Development Life Cycle (SDLC) is composed of four fundamental phases:

Phase 1: Planning

• This phase is the fundamental process of understanding why an information system should be built

• This phase will also determine how the project team will go about building the information system

• This phase is composed of 2 steps

Project Initialization

(2 Planning Steps)
- During this, the systems’ business value to the organization is identified

Project Management

(2 Planning Steps)

• During this, the project manager creates a work plan, staffs the project, and puts techniques in a place to help the project team control and direct the project through the entire SDLC

Phase 2: Analysis

• This phase answers the questions of who will use the system, what the system will do, and where and when will it be used

• During this phase the project team investigates any current system, identifies improvement opportunities, and develops a concept for the new system

• This phase has three analysis steps

Analysis Strategy

(3 Analysis Steps)

• This is developed to guide the project team’s efforts. This includes an analysis of the current system.

Requirements Gathering

(3 Analysis Steps)

• The analysis of this information leads to the development of a concept for a new system. This concept is used to build a set of analysis models

System Proposal

(3 Analysis Steps)

• The proposal is presented to the project sponsor and other key individuals who decide whether the project should continue to move forward

• It is the initial deliverable that describes what business requirements the new system should meet.

Phase 3: Design

• This phase is when it is decided how the system will operate, in terms of the hardware, software, and network infrastructure; the user interface, forms, and reports that will be used; and the specific programs, databases, and files that will be needed.

• This phase has 5 steps

Design Strategy

(5 Design Steps)

• This clarifies whether the system will be developed by the company or outside the company

Architecture Design

(5 Design Steps)

• This describes the hardware, software, and network infrastructure that will be used

Database and File Specifications

(5 Design Steps)

• These documents define what and where the data will be stored

Program Design

(5 Design Steps)

• Defines what programs need to be written and what they will do

Phase 4: Implementation

• During this phase, the system is either developed or purchased (in the case of packaged software)

• This phase is usually the longest and most expensive part of the process

• This phase has 3 steps

System Construction

(3 Implementation Steps)

• The system is built and teste to make sure it performs as designed.

Installation

(3 Implementation Steps)

• Prepare to support the installed system.

Support Plan

(3 Implementation Steps)

• Includes a post-implementation review.