Part III System Analysis and Design; Programming

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Part III System Analysis and Design; Programming. Decision Support Systems Pictorial Model Tools: Excel, VBA, IFPS *. Decision Support Systems (1.2). Supports Decisions Must identify decision criteria (e.g., balance in check writing )

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Presentation Transcript
Part IIISystem Analysis and Design; Programming
• Decision Support Systems
• Pictorial Model
• Tools: Excel, VBA, IFPS

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Decision Support Systems(1.2)
• Supports Decisions
• Must identify decision criteria (e.g., balance in check writing)
• “Functions” for most frequently used (significant few) tools
• Programming tools for “trivial many” customization
Pictorial Model
• Modeling (1.2) (Transformation Function, what is it? what are the significances of using this term?)
Pictorial Model
• Consists of Pictorial Diagram and equations (pp. 2-3, 5-2)
• Uses numbers to identify equations and their sequence
• The number of lines out of an attribute indicates its influence to the entire model.
Pictorial Model
• Boundary variables have no predecessor
• Boundary variables will become “assumptions” in IFPS programs
Tools: Excel
• Quick solution; ready-to-use functions (e.g., pmt, stdevp)
• Once set up, users can change input parameters (e.g., interest rate, loan amount) to “reuse” this “program”
• Not as flexible but less knowledge in programming is needed.
Tools: VBA
• For any programming language, must know “input” and “output” first
• All programs can be broken down to sequential, iterative (loops), and selection (if-then)
• VBA uses spreadsheet as the source of data (input) and display of results (output) -- see handouts
Tools: VBA
• More flexible (e.g., length of annuity table does not have to be pre-determined)
• Programming idiosyncrasies (e.g., ‘=‘ means assign and not equal)
• Most fundamental functions: a=a+1 (counter) and sum=sum+a
• for-next loop and if-then-else (see handouts)
Standard Deviation Example
• For Logical Design step, research the process by reading books (document) and look for formula (form)
• Definitional Formula is easier to understand (why?)
• Computational Formula is more efficient (why?)
Tools: IFPS
• 4GL (see 1.3 and 1.6)
• Extract equations (i.e., business model) from descriptions
• Organize the pictorial diagram starting with the goal (e.g., profit) and work backwards
• Once the pictorial model is done, the IFPS program is basically done as well.
Tools: IFPS
• Compared to Excel, IFPS can do what-if analysis (manipulate input variables) as well
• Goal seeking allows user to pre-determine the outcome and view the possible choice of input variables
• Simple graphics and report generation for final decision making
Economic Analysiswhy graphics?
• Direction and Magnitude (slope of a curve, coefficient for regression line)
• Graphics allow a quick view of the long-term trend
• Knowledge of the attributes is more important than the knowledge of the tools
• Knowledge of the tool enhances the ability to analyze
Tools: IFPS
• “Right” is subjective
• Easy-to-use modeling tool (compared to Excel and VBA) allows the management to move into Physical Design and Implementation/ Testing stage (End-user development in Laudon chapter 11, p. 349)