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DSS Design
MTIS Approach
Source: http://home.ubalt.edu/abento/300/design_paper.html
MTIS Approach Management concept
Obtaining results through people Obtaining results through information systems
Steering activities:
activities that change the existing ways of delivering goods and services, or create new ones.
Types of DSS
Data oriented (data analysis models) model oriented (if-then models) data and model oriented (complex models)
If-Then Models
DSS analysis Influence diagram requisite variety application
DSS design variables -for-manipulation dialog decision tree diagram DSS generator-specific
implementation principle
Influence Diagram AnalysisA. Prepare a problem narrative
B. Classify variables
1. Decision variables : under control of decision-maker2. Outcome variables : results, measure of performance3. Exogenous/assumptions : affect but are not affected4. Intermediary variables : necessary to link other variables
C. Draw influence diagram
Decision variables
Exogenous and Intermediary variables
Outcome variables
Influences
D. Derive equations for modeling the problem
Classification of Variables
Decision variables Intermediate variablesSales Price VolumeInvestment Net Sales Unit Cost
Direct Costs Outcome variables Mfg Overhead
Net After Tax Cost of SalesRate of Return Depreciation Gross Profit
Exogenous/Assumption Admin ExpensesMarket Growth Net Before TaxTax Rate
Influence Diagram
Equations for Sales Price and Investment Decisions
Volume = 15,000 * (1+Mkt Growth) - 6,666 * Sales PriceUnit Cost = 1.3 - .00009 * InvestmentNet Sales = Sales Price * VolumeDirect Costs = Unit Cost * VolumeMfg Overhead = .1 * Net SalesCost of Sales = Mfg Overhead + Direct CostsGross Profit = Net Sales - Cost of SalesDepreciation = Function(Investment)Admin Expenses = .04 * Net SalesNet Before Tax = Gross Profit - Admin Expenses - DepreciationNet After Tax = (1-Tax Rate) * Net Before TaxRate of Return = Function( Net After Tax, Depreciation,
Investment)
Dialog Decision Tree Diagram
Implementation Principle
ss ss ss
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ss ss ss
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one spreadsheet many spreadsheets
many spreadsheets
Diagonal Serial
3-D
cell addresses macros
3-D cell addresses