1. Information Systems Architecture (ISA)
Conceptual blueprint for organization’s desired information systems structure
Consists of (6Ws):
Processes–data flow diagrams, process decomposition, etc. (DFD- Data Flow Diagram)
Data (e.g. Enterprise Data Model–ER Diagram)
Data Network–topology diagram (like Fig 1-9)
People–people management using project management tools (Gantt charts, etc.)
Events and points in time (when processes are performed. Use case diagram)
Reasons for events and rules (e.g., decision tables)
How
What
Where
Who
When
Why

2. Data Flow Diagrams
Data flow diagrams (DFDs) are graphical aids that describe an information system
Advantages:
freedom from committing to the technical implementation of the system too early.
Further understanding the interrelatedness of systems and subsystems.
communicating current system knowledge to users .

3. Data Flow Diagrams Data flow diagram symbols Four basic symbols
Process
Data flow
Data store
External entity

4. Process
External entities
Data flows

5. Data store

8. Data Dictionary Data structure Data structure Data structure Program
Modules

9. Develop Enterprise Model
Functional decomposition
Iterative process breaking
system description into finer and finer detail
Enterprise data model
Planning matrixes
Describe interrelationships
between planning objects

10. Example business function-to-data entity matrix (Fig. 2-3)
Spot missing
entity
Higher
priority