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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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part iii system analysis and design programming
Part IIISystem Analysis and Design; Programming
  • Decision Support Systems
  • Pictorial Model
  • Tools: Excel, VBA, IFPS

*

decision support systems 1 2
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
Pictorial Model
  • Modeling (1.2) (Transformation Function, what is it? what are the significances of using this term?)
pictorial model1
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 model2
Pictorial Model
  • Boundary variables have no predecessor
  • Boundary variables will become “assumptions” in IFPS programs
tools excel
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
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 vba1
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
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
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 ifps1
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 analysis why graphics
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 ifps2
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)
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