IS = Parts working together to deliver information to users. The importance of the process aspect—what processes do (system functionality), and how they.

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Presentation transcript:

IS = Parts working together to deliver information to users. The importance of the process aspect—what processes do (system functionality), and how they take control over system (logic). Common View of IS: data, IT, processes, user interface What is Information System: Systems Analysis & Design Summary More…

System Services View of IS: - data processing - data management - user interface System Architecture View: IS is interrelated tiers. What is Information System Object View: system parts are object and classes; packages and components.

Systems analysis— - Analyzing organizational tasks and processes that deliver some information—application domain - Includes manual task and processes - Deliverable: Logical design The Emphasis of the Course Systems Design (some exercises, term paper)

Data Process/Functionality Logic (control, decisions) User Interface Object Interactions Data Flow Diagram Class/Object Diagram Activity Diagram Use Case Diagram Decision Table Sequence Diagram Dialogue Diagram xx x x x xxx xx x x x x x x = primary purpose a diagram is invented for = provides hints/indications 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 7 diagrams for systems analysis studied (see table) 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…) More…

2 Tools: MS Project, Visio Different systems studied: sales and inventory tracking doctor appointment, , DSS prescriptions management Web storefront order management class registration… Some Highlights

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!