Systems Analysis Design Summary What is Information System
- Slides: 8
Systems Analysis & Design Summary What is Information System: • IS = Parts working together to deliver information to users. • Common View of IS: data, IT, processes, user interface • The importance of the process aspect—what processes do (system functionality), and how they take control over system (logic). More…
What is Information System • Object View: system parts are object and classes; packages and components. • System Services View of IS: - data management - data processing - user interface • System Architecture View: IS is interrelated tiers.
The Emphasis of the Course • Systems analysis— - Analyzing organizational tasks and processes that deliver some information—application domain - Includes manual task and processes - Deliverable: Logical design • Systems Design (some exercises, term paper)
Data x Process/Functionality x Logic (control, decisions) x x x User Interface Object Interactions x = primary purpose a diagram is invented for x = provides hints/indications x x x am gr ia D gu lo ia x x e ce D Se qu n is io en Ta bl D ia e gr a m ra ag D ec ity Di Di tiv x m m ag ra gr Ac Da ta Fl ow t. D ia ec bj O s/ as Cl Us e Ca se Di ag ra m am Tools for Systems Analysis
Challenges in Systems Analysis • What is in the system? Where is system boundary? • Process thinking (DFD, Activity Diagram) vs. Non-process thinking (use case diagram) • Focus on details and completeness • Capability to switch between big and small pictures • Capability to read (and sometimes write) different notation schemes.
Some Highlights • MIS Perspective emphasized: - IS delivers information that serves organizational & management purposes - Management perspective (systems examples rooted in specific organizational contexts; concern with end-users, cost-benefit, systems adoption…) • 7 diagrams for systems analysis studied (see table) More…
Some Highlights • 2 Tools: MS Project, Visio • Different systems studied: sales and inventory tracking doctor appointment, email, DSS prescriptions management Web storefront order management class registration…
Links to database management course (9. 350) • Data modeling (class and object diagram) – drill down on data part of class/object, not so much on methods part. • Information system – the data foundation is in DB systems. IS is a more specific application, with a purpose defined by the type of data/information it delivers. That’s All Folks!