This document discusses the system development life cycle (SDLC) process for developing IT solutions within an organization. The SDLC includes 5 phases - investigation, analysis, design, implementation, and maintenance. The analysis phase involves gathering requirements and modeling the system using tools like data flow diagrams to understand how data will flow through the various processes. This helps identify what needs to be done and how during the design phase.

1. DEVELOPING IT SOLUTIONS IN
ORGANIZATION

2. ERP Modules

3. System Development Life Cycle (SDLC)
• Development of Information System for
solving business problems is Information
System or Application Development’
• Systems are designed and implemented using
a systematic development process – Systems
Analysis & Design

4. SDLC Life Cycle

5. Steps in SDLC
1)Investigate
2)Analyze
3)Design
4)Implement
5)Maintain

6. 1.INVESTIGATION

7. Investigation
1) Is there a business problem?
2) Reason of problem?
3) Will new & improved Information System
solve the problem?
4) Which is most feasible Information System
solution to problem?

8. Investigation Phase

9. Feasibility /Analysis Study
• Analysis of risk, costs and benefits to each
alternative solution of problem

10. Types of Feasibility Study

11. Technical Feasibility
• Suggested technology exists? Acquired?
• Recommended solution handle sufficient data
required for new solution?
• Offer responses to enquiries from number of
users from different locations
• System expandable?
• Technical guarantee for accuracy ,reliability
and security?

12. Economic Feasibility
• Cost Benefit Analysis
• Cost of hardware ,software ,license ,personnel
,office space etc vis a vis benefits
• Recovery of costs?

13. Operational Feasibility
• Can people work with new system?
• Supported by Management & Users?
• Current methods acceptable to all?
• Change impact customers?
• Change slow down performance in any area?

14. Legal Feasibility
• Copyright , IPR infringement ?
• License ?

15. 2. ANALYSIS

16. SYSTEM ANALYSIS
• What to do?
• How to do?
• Systematic investigation of real or planned
system to determine function of the system &
how they relate to each other and to any
other system
• In software development , requirement phase
is most crucial .
• User controlled stage

17. Characteristics of System Analysis
• Top Down Approach
• Use of Tools and Techniques – Functional Diagrams ,
DFDs , process specs , Entity relationships with
techniques and models
• Abstraction of Model- Creation of physical and logical
model
• Iterative Development –Improvement in analysis and
design in current step ensures improvement in
previous steps
• Advanced Technology
• Prototype

18. System Analysis Activities

19. Phases of System Analysis

20. Phases of System Analysis
• Requirement Determination /Fact finding –
study of current system and scope of
adjustments and improvements
• Data gathering activity done during Analysis

21. Data Flow Diagram (DFD)
• Graphical representation of data flow through
an Information System is called DFD
• Used for problem understanding and Analysis
of system
• Depicts flow of data through the system
• DFD captures the transformation of input data
to produce output data
• DFD reflects movements of data through the
different transformation in the system

22. Elements of DFD
• 1.Process –Activity performed according to incoming
data flow or conditions – represented as ‘circle’ or
‘rectangle’
• 2Data Flow – Input /Output of data – represented by
‘solid line with arrow”
• 3 External Entity – Another department . A business,
person ,machine can be used to send or receive data to
and from the system . Represented by ‘square’
• 4.Data Store – Data is stored in ‘data store’ –
represented by ‘open ended box’, inventory of data

23. Elements of DFD

24. Levels of DFD
• 1.Context Diagram –highest level in DFD –
single process representing entire system
• 2. O Level Diagram – All process models have
only one level 0 DFD

25. Context Diagram- University
Registration System

26. 0-Level Diagram

27. DFD OF Pay Management System