Chapter 9 Notes

Chapter 9 Notes - 1 Chapter 9 Describing Process...

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Unformatted text preview: 1 Chapter 9 Describing Process Specifications and Structured Decisions Systems Analysis and Design Kendall & Kendall Seventh Edition 2 Learning Objectives Understand the purpose of process specifications Recognize the difference between structured and semistructured decisions Use structured English, decision tables, and decision trees to analyze, describe, and document structured decisions Choose an appropriate decision analysis method for analyzing structured decisions and creating process specifications 2 3 Logic of Decisions Documenting and analyzing logic: Structured English Decision tables Decision trees Logic and structured decisions are distinguishable from semistructured decisions Structured decision analysis methods promote completeness, accuracy, and communication 4 Major Topics Process specifications Business rules Structured English Decision tables Decision trees Horizontal balancing 3 5 Process Specifications Process specifications Small portion of total project specifications. created for primitive processes and some higher level processes on a data flow diagram. Explain the decision making logic and formula that transform process input into output. Also called minispecs. 6 Goal of Creating Process Specifications Three goals of producing process specifications : Reduce process ambiguity. Obtain a precise description of what is accomplished. Validate the system design, including data flow diagrams and the data dictionary. 4 7 Process Specifications Process specifications are not created for very simple process Some categories of processes that do not need specs: Physical input and/or output processes, like read and write Require simple logic. Processes that represent simple data validation. Easy to accomplish Processes for which prewritten code already exists. 8 Data Flow Diagram and Process Specifications How process specifications relate to the data flow diagram . 5 9 Process Specification Format Information The process number The process name Description of what the process accomplishes A list of input data flow Output data flows Type of process Uses prewritten code Process logic description Logic method reference List any unresolved issues 10 Process Specification Format Information needed to be entered: The process number, which must match the process ID on the data flow diagram. This allows an analyst to work or review any process and easily locate the data flow diagram containing the process. The process name, the same as displays within the process symbol on the DFD. A brief description of what the process accomplishes....
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Chapter 9 Notes - 1 Chapter 9 Describing Process...

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