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INFORMATION SYSTEMS DEVELOPMENT
WHAT IS INFORMATION SYSTEM DEVELOPMENT
• It is the process (activity) whereby a work activity or a larger organizational setting
is facilitated by introducing a new socio-technical information system or modifying
or expanding an existing one.
WHY INFORMATION SYSTEM DEVELOPED ?
STAGES OF INFORMATION SYSTEM
DEVELOPMENT
• System Investigation – Understand the problem
• System Analysis – Understand solution
• System Design – Select and Plan best solution
• System Implementation – Place the solution in effect
• System Maintenance And Review – Evaluate the result of solution
SYSTEM INVESTIGATION
• System Investigation is the process of finding out what the system is being built to
do and if the system is feasible.
 Identification of need
 Need for change or improvement of existing system
INITIATING SYSTEM INVESTIGATION
• Systems request form
 Submitted by someone who wants IS department to initiate systems investigation
 Information included
• Problems in or opportunities for system
• Objectives of systems investigation
• Overview of proposed system
• Expected costs and benefits of proposed system
SYSTEM ANALYSIS
FEASIBILITY ANALYSIS
• Feasibility analysis, also known as Feasibility Study, intends to equitably
and logically examine the pros and cons of an existing or a proposed
business, dangers related to the venture, required resources to carry out the
operations, and eventually the probability of success.
FACTORS OF FEASIBILITY ANALYSIS
• Operational – Control efficiency and Service
• Technical – Risk assessment and Solution
• Schedule – Timeline estimation and Optimisation of resources
• Economic – Cost benefit analysys
BENEFITS OF FEASIBILITY ANALYSIS
DATA ANALYSIS
• Data analysis is the practice of working
with data to glean useful information,
which can then be used to make
informed decisions
STAGES DATA ANALYSIS
• Identify
• Collect
• Clean
• Analyze
• Interpret
SYSTEM DESIGN
• Activity modelling
DATA FLOW DIAGRAM
• Data Flow Diagram (DFD) is a graphical representation of data flow in any
system.
• It is capable of illustrating incoming data flow, outgoing data flow and store data.
• Data flow diagram describes anything about how data flows through the system.
• Types of Data Flow Diagram
Logical DFD
Physical DFD
DATA FLOW DIAGRAM
Logical DFD:
Logical data flow diagram mainly focuses on the system process. It illustrates how
data flows in the system. Logical DFD is used in various organizations for the smooth
running of system. Like in a Banking software system, it is used to describe how data
is moved from one entity to another.
Physical DFD:
Physical data flow diagram shows how the data flow is actually implemented in the
system. Physical DFD is more specific and close to implementation.
ELEMENTS OF DATA FLOW DIAGRAM
• Data Flow – Data flow (flow, dataflow)
shows the transfer of information
(sometimes also material) from one part
of the system to another.
• Process Symbol – Process symbols are
also commonly called flowchart symbols,
flowchart shapes or flow diagram
symbols. These symbols come from the
Unified Modeling Language or UML,
which is an international standard for
drawing process maps.
• Entity Symbol – This provides Data
information to the system or receives
data from it. The Entity can be internal
or external .
• Data store – A data store is a repository
for persistently storing and managing
collections of data which include not just
repositories like databases, but also
simpler store types such as simple files,
emails, etc.
Information Systems Development.pptx
DATA FLOW DIAGRAM
Information Systems Development.pptx
Information Systems Development.pptx

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Information Systems Development.pptx

  • 2. WHAT IS INFORMATION SYSTEM DEVELOPMENT • It is the process (activity) whereby a work activity or a larger organizational setting is facilitated by introducing a new socio-technical information system or modifying or expanding an existing one.
  • 4. STAGES OF INFORMATION SYSTEM DEVELOPMENT • System Investigation – Understand the problem • System Analysis – Understand solution • System Design – Select and Plan best solution • System Implementation – Place the solution in effect • System Maintenance And Review – Evaluate the result of solution
  • 5. SYSTEM INVESTIGATION • System Investigation is the process of finding out what the system is being built to do and if the system is feasible.  Identification of need  Need for change or improvement of existing system
  • 6. INITIATING SYSTEM INVESTIGATION • Systems request form  Submitted by someone who wants IS department to initiate systems investigation  Information included • Problems in or opportunities for system • Objectives of systems investigation • Overview of proposed system • Expected costs and benefits of proposed system
  • 8. FEASIBILITY ANALYSIS • Feasibility analysis, also known as Feasibility Study, intends to equitably and logically examine the pros and cons of an existing or a proposed business, dangers related to the venture, required resources to carry out the operations, and eventually the probability of success.
  • 9. FACTORS OF FEASIBILITY ANALYSIS • Operational – Control efficiency and Service • Technical – Risk assessment and Solution • Schedule – Timeline estimation and Optimisation of resources • Economic – Cost benefit analysys
  • 11. DATA ANALYSIS • Data analysis is the practice of working with data to glean useful information, which can then be used to make informed decisions
  • 12. STAGES DATA ANALYSIS • Identify • Collect • Clean • Analyze • Interpret
  • 14. DATA FLOW DIAGRAM • Data Flow Diagram (DFD) is a graphical representation of data flow in any system. • It is capable of illustrating incoming data flow, outgoing data flow and store data. • Data flow diagram describes anything about how data flows through the system. • Types of Data Flow Diagram Logical DFD Physical DFD
  • 15. DATA FLOW DIAGRAM Logical DFD: Logical data flow diagram mainly focuses on the system process. It illustrates how data flows in the system. Logical DFD is used in various organizations for the smooth running of system. Like in a Banking software system, it is used to describe how data is moved from one entity to another. Physical DFD: Physical data flow diagram shows how the data flow is actually implemented in the system. Physical DFD is more specific and close to implementation.
  • 16. ELEMENTS OF DATA FLOW DIAGRAM • Data Flow – Data flow (flow, dataflow) shows the transfer of information (sometimes also material) from one part of the system to another. • Process Symbol – Process symbols are also commonly called flowchart symbols, flowchart shapes or flow diagram symbols. These symbols come from the Unified Modeling Language or UML, which is an international standard for drawing process maps. • Entity Symbol – This provides Data information to the system or receives data from it. The Entity can be internal or external . • Data store – A data store is a repository for persistently storing and managing collections of data which include not just repositories like databases, but also simpler store types such as simple files, emails, etc.