STUDY GUIDE - STUDY GUIDE Chapter 1: Introduction To...

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STUDY GUIDE Chapter 1: Introduction To Systems Analysis and Design I) System A) A system is an interrelated set of business procedures used within one business unit working together for a purpose B) A system has 9 Characteristics B.1) Components B.2) Interrelated Components B.3) Boundary B.4) Purpose B.5) Environment B.6) Interfaces B.7) Constraints B.8) Input B.9) Output C) A system exists within an environment D) A boundary separates a system from its environment E) Important System Concepts
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E.1) Decomposition E.1.a) The process of breaking down a system into smaller components E.1.b)Allows System Analyst to: E.1.b.i) Break a system into small, manageable subsystems E.1.b.ii) Focus on one area at a time E.1.b.iii) Concentrate on component pertinent to one group of users E.1.b.iv) Build different components at independent times E.2) Modularity E.2.a) Process of dividing a system into modules of a relatively uniform size E.2.b)Modules simplify system design E.3) Coupling E.3.a) Subsystems that are dependent upon each other are coupled E.4) Cohesion E.4.a) Extent to which a subsystem performs a single function II) Information System A) What are Information Systems? A.1) Combinations of hardware, software, telecommunications networks and procedures that are constructed and utilized by people to collect, create, retrieve, manipulate, and distribute data in/across organizing B) Types of Information Systems B.1) TPS (Transaction Processing Systems) B.1.a)Inputs are transactions processing includes sorting, listing, merging and updating B.1.b)Outputs are detailed reports, lists, summaries, etc.
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B.1.c)Users are operations personnel, supervisors B.2) MIS (Management Information Systems) B.2.a)Inputs are summary transaction data or high volume data B.2.b)Processing involves running routine reports often using simple models B.2.c)Outputs include summary and exception reports B.2.d)Users are primarily middle managers B.3) DSS (Decision Support Systems) B.3.a)Inputs include low volume data, analytical models B.3.b)Processing is interactive and involves simulations, what-if analysis, etc. B.3.c)Outputs are special reports, decision analyses, response to open-ended queries B.3.d)Users are mainly analytical staff-managers B.4) ESS (Executive Support Systems) B.4.a)Inputs consist of aggregate data from external as well as internal sources B.4.b)Processing is interactive and consists mainly of graphical analysis and simulations B.4.c)Outputs are usually projections, and responses to queries
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This note was uploaded on 04/03/2012 for the course MIS 322 taught by Professor Staff during the Spring '08 term at Washington State University .

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STUDY GUIDE - STUDY GUIDE Chapter 1: Introduction To...

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