SYSTEMS DEVELOPMENT LIFE CYCLE (SDLC)

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SYSTEMS DEVELOPMENT LIFE CYCLE(SDLC)
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GROUP MEMBERS

• HALIDE ÖZBASLI
• I. TUGÇE BOZ
• MURAT IRKKAN

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SYSTEM

• Tools
• Supplies
• Machines
• Procedures
• People

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Types of System

• Business System
• Information System

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Business System
Vice Precident
Senior Professional
Pricing Manager
Principal Analyst
Professional
Load Analyst
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Information System
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System Analysis and Design

• Analysis
• What must be done?
• Design
• How it will be done?

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The System Analyst
Vice President of Information Systems
Administrative Assistant
Manager of System Analysis
Manager of Programming
Manager of Technical Support
Systems Analysts
User Services Personel
Application Programmers
Systems Programmers
Database Administrators
Organizational Chart
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System Development Methodology
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Systems Development Life Cycle
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SDLC s Phases
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SDLC s First Phase

• Major Function Establishing that a problem
  exists.
• Output Feasibility study.
• Tasks A user notifies an analyst that a problem
  exists.

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Recognize the problem And identify causes
An Example of Scientific Problem-Solving Process
Express problem in quantitive terms
Analyse choices And selectPlan
Implement the solution
Evaluate Results And optimize
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SDLC s First Phase

• Major Function
• To define the problem and determine whether or
  not a new system is feasible.
• OutputFeasibility Study.
• Principal Tools
• Fact-gathering techniques and requirements
  estimation.

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SDLC s First Phase
Tasks 1.Collecting information about the
problem. 2.Developing possible
solutions. 3.Developing more precise estimates of
requirements for the analysis phase to
fallow. 4.Management decides to continue the
project or not.
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SDLC s Second Phase
Major Function To determine the requirements of
a proposed new system. Output Problem
specification.
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Tools Principal Tasks 1.Studying documents of
the current system in order to understand both
its flaws and its strong points. 2. Preparing a
list of requirements for a new system. 3.
Preparing a prototype of the system.
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4.The analyst diagrams the functions of the new
system without specifying exactly how those
functions are performed.
Process
Data store
Source/Sink
Data flow
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AN EXAMPLE FOR DATA FLOW DIAGRAM
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SDLC s Third Phase
Major Function Design a new system Output Design
specifications
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SDLC s Third Phase

• Principal Tools
• Data flow diagrams
• Data models
• System models
• Prototyping
• Personnel and Tasks
• Order hardware and software
• Transform into hierarchy
• Incorporate security
• Design input and output
• Design database

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Work Flow Chart Example
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SDLC s Fourth Phase
Major Function Write and test program Output Co
ded and tested programs User documentation Trainin
g materials
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SDLC s Fourth Phase

• Personnel and task

• Prepare site
• Write programs
• Test programs
• Prepare documentation and training
• Enter new data
• Begin using system

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SDLC s Fifth Phase
Major Function Repair and upgrade the
system Output Updated program User
documentation Revised programs
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SDLC s Fifth Phase

• Personnel and Task
• Recognize problem
• Prepare incremental model
• Decide whether to implement
• Modify documentation
• Modify programs
• Test programs
• Use modified system

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Managing the Information Systems Project

• Project
• Deliverable
• Project Management
• Project Initiation
• Project Planning
• Work Breakdown Structure
• Gantt Chart
• Pert Chart
• Project Execution

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Gantt Chart
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Managing the Information Systems Project

• Project
• Deliverable
• Project Management
• Project Initiation
• Project Planning
• Work Breakdown Structure
• Gantt Chart
• Pert Chart
• Project Execution

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Pert Chart
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Managing the Information Systems Project

• Project
• Deliverable
• Project Management
• Project Initiation
• Project Planning
• Work Breakdown Structure
• Gantt Chart
• Pert Chart
• Project Execution