Summary of lectures 5

Week 5 - Tradditional or structured approach to Analysis
DFD and levels of abstraction
*these are the diagrams that provide multiple level of detail
*Higher level diagrams provide general view of system
*Low level diagrams peovide detail level of system
*Different views are known as level of abstraction

Context diagrams
This is a DFD that summarizes all the processing activity and shows system boundaries.
*this used OOA also

INFORMATION ENGINEERING MODELS
This mainly focuses on Enterprise size, data requirments and Strategic planning
This shares features with structured system developement

Mainly DFD's are easy to read and can show all the key features of system
Analyst may define processes as structured English process specification, decision table, decision tree, or process decomposition DFD
Models from IE may supplement DFDs– Process decomposition diagram (how processes onmultiple DFD levels are related)– Process dependency diagram (emphasizesinteraction with stored entities)– Location diagram (geographic where system used)– Activity-location matrix (which processes areimplemented at which locations)– Activity-data (or CRUD) matrix (where data used).
End of lecture