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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

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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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