DSS DESIGN II

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DSS DESIGN II

• IS4185 Session 9
• Prof. Mark Nissen

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Agenda

• DSS Design Approach
• CSF Analysis
• ROMC T Method
• Portfolio Management Example

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DSS Design Approach Decision-Maker Centric

• Analyze existing process (not BPR)
• Formalize decision problem
• Decision steps, variables models
• Preliminary KA/CSF analysis
• DM behavioral description
• ROMC T method
• Knowledge/data acquisition
• Rapid, iterative prototyping

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CSF Analysis

• ID what must go well, how to tell
• 4 elements
• Mission - why enterprise exists (1/DSS)
• Goals - what to accomplish (1-2/mission)
• CSFs - what must go well (1-2/goal)
• Measures - how to tell CSF met (2-3/CSF)
• DSS data requirements
• Starting point for behavior ROMC

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ROMC T Method

• Follow CSF behavioral
• Process independent
• Elements on DSS design palette
• Representations
• Operations
• Memory Aids
• Controls
• Technologies

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Representations

• How DM views interprets problem
• Can think of user screen displays
• Examples maps, tables, scatterplots charts,
  reports lists, models, rules, natural language
• Key how does DM represent problem without DSS?

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Operations

• Manipulations to data representations
• Help understand, analyze, interpret, etc
• Can think of user actions/analyses
• Examples
• create, retrieve, update, delete info
• plot, scale, mark, color, compare maps/graphs
• generate, edit, check reports/lists
• build, validate, execute, maintain models
• initiate, recall, verify, forward conversations
• develop, validate, search rules
• What does DM do w/o DSS?

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Memory Aids

• Assist short- long-term memory
• Can think of data sources
• Examples scratch space, memory, storage,
  reports, scripts, protocols, notes
• Key what aids does DM use without DSS?

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Controls

• How user interfaces with and uses DSS
• Can think of navigation mechanisms
• Examples input forms, menus, question-answer
  pairs, direct manipulation objects, commands,
  scripts, agents, others
• Key match flow of DM activity without DSS

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Technologies

• ROMC is technology-neutral
• Technical artifacts that enable ROMC elements to
  be supported via computer
• Can think of IT tools
• Examples imaging, databases, languages, solvers,
  memory, magnetic storage, printers, networks,
  recorders, shells, others
• Key what technologies are available, familiar
  low-risk?

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ROMC T Table
Letters (a-z) denote Rs, Os, Ms, Cs Ts
available on DSS designer palette
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Portfolio Management Example

• Ms. Roller manages 1 stock portfolio
• Only SP500 securities
• Monthly inflow of capital to invest
• Monitors portfolio throughout day
• Ms. Roller is DM

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Portfolio Management Example (Cont)

• CSF analysis
• Mission manage stock portfolio
• Goals accumulate returns with acceptable risk
• CSFs
• Gains must exceed losses
• Returns must compensate for risk
• Measures gains, losses (buy/sell prices),
  volatility, risk-free rate

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Portfolio Management Example (Cont)

• Intelligence, design, choice behavior
• ID need to trade stocks
• Assess rank alternatives
• Select preferred buy/sells
• Takes action from thresholds
• Portfolio exceeds high --gt sell stocks
• Portfolio falls below low--gt buy stocks
• New capital --gt buy stocks
• Otherwise hold

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Portfolio Management Example (Cont)

• Identifies evaluates alternatives
• From SP500 index
• Projects returns for current year
• Rank from PE ratios volatility indices
• Other heuristics
• Trade with insiders (3 or more people)
• Trade on news (3 or more stories)
• Trade on gossip (3 or more rumors)
• Selects best stocks to buy sell

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Exercise

• Use ROMC T method
• Develop high-level DSS design