Approaches to Systems Development Chapter 10 - part 1

Outline Introduction Ch 10 - Approaches to System Development Systems Analyst Ch 10 - Approaches to System Development SDLC Phases & Core Processes Approaches: Predictive & Adaptive Methodology Agile Development

Systems Analyst Organizational role most responsible for the analysis & design of information systems. Translates a _________ __________ into an ___________ ___________ ___________ . Job Titles vary by organization; read the job description Systems Analyst Business Analyst (client-facing)

…more of a business problem solver than a technical programmer Systems Analyst …more of a business problem solver than a technical programmer Knowledge & Skills Technical DB, Programming, Computers Hardware, Networking, Operating systems, and utilities, Communication & collaboration technology SDLC techniques Business Organizational knowledge Management techniques Functional work processes People Communication skills Interpersonal Skills Roles: Negotiator, Teacher, Mentor, Collaborator, Manager

Information System Development Project What is it? It's a planned undertaking Has fixed beginning and end Produces desired result or product It can differ in… Features Size Cost Resources

SDLC: Systems Development Life Cycle Provides overall framework for managing systems development process All projects use some variation of SDLC Phase Project Initiation Planning Analysis Design Implementation Deployment Core Process 1. Identify the problem/need & obtain approval 2. Plan & monitor the project 3. Discover & understand the details 4. Design the system components 5. Build, test, and integrate system components 6. Complete system tests and deploy solution Ch 11 Ch 11 Ch 2-5 Ch 6, 8-9,12-13 Ch 13 Ch 14

2 Approaches to the SDLC Assumptions Assumptions Predictive SDLC Adaptive SDLC Waterfall Model Modified Waterfall Spiral Model Incremental Development Assumptions can be planned in advance system can be developed according to the plan Assumptions Iterative Must be flexible & adapt

Predictive Approaches Waterfall One phase begins when another completes; Specifications are frozen Support Deployment Planning Analysis Design Implementation Project Initiation Problems System requirements “locked in” Limited user involvement Too much focus on milestone deadlines Modified Waterfall Overlapping phases Can go backwards Support Deployment Planning Analysis Design Implementation Project Initiation

Adaptive Approaches Spiral Model An iterative approach Spiral until project completion Then, deployed! Project Management: managed differently than a waterfall approach

Adaptive Approaches Incremental Development Also, an iterative approach BUT… System is built in small increments; it is "grown" As an iteration is completed it is integrated to the whole Partially deployed in steps Advantage some functionality gets into the user's hands much earlier

Methodology A comprehensive guideline to follow for completing every SDLC activity Abstraction used to separate out aspect Methodology Models Techniques Tools Software to create models or other project components Guidelines or instructions