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LECTURE 5 Amare Michael Desta

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1 LECTURE 5 Amare Michael Desta
Decision Support & Executive Information Systems: LECTURE 5 Amare Michael Desta

2 Decision Support Systems
- Systems designed to support managerial decision-making in unstructured problems - More recently, emphasis has shifted to inputs from outputs - Mechanism for interaction between user and components - Usually built to support solution or evaluate opportunities

3 Role of Systems in DSS - Inputs - Processes - Outputs
Structure - Inputs - Processes - Outputs - Feedback from output to decision maker - Separated from environment by boundary - Surrounded by environment Input Processes Output boundary Environment


5 System Types - Closed system - Independent - Takes no inputs
- Delivers no outputs to the environment - Black Box Open system - Accepts inputs - Delivers outputs to environment

6 Decision-Making (Certainty)
- Assume complete knowledge - All potential outcomes known - Easy to develop - Resolution determined easily - Can be very complex

7 Decision-Making (Uncertainty)
Several outcomes for each decision Probability of occurrence of each outcome unknown Insufficient information Assess risk and willingness to take it Pessimistic/optimistic approaches

8 Decision-Making (Probabilistic)
Decision under risk Probability of each of several possible outcomes occurring Risk analysis Calculate value of each alternative Select best expected value

9 Influence Diagram (Presenting the model)
Graphical representation of model Provides relationship framework Examines dependencies of variables Any level of detail Shows impact of change Shows what-if analysis


11 Modeling with Spreadsheets
Flexible and easy to use End-user modeling tool Allows linear programming and regression analysis Features what-if analysis, data management, macros Seamless and transparent Incorporates both static and dynamic models


13 Simulations - Allows for experimentation and time compression
- Imitation of reality - Allows for experimentation and time compression - Descriptive, not normative - Can include complexities, but requires special skills - Handles unstructured problems - Optimal solution not guaranteed - Methodology - Problem definition - Construction of model - Testing and validation - Design of experiment - Experimentation & Evaluation - Implementation

14 Simulations Probabilistic independent variables
- Discrete or continuous distributions - Time-dependent or time-independent - Visual interactive modeling - Graphical - Decision-makers interact with model - may be used with artificial intelligence - Can be objected oriented


16 Decision Making - Process of choosing amongst alternative courses of action for the purpose of attaining a goal or goals. - The four phases of the decision process are: (Simon’s) - Intelligence - Design - Choice - Implementation - Monitoring (added recently)


18 Decision-Making Intelligence Phase
- Scan the environment - Analyze organizational goals - Collect data - Identify problem - Categorize problem - Programmed and non-programmed - Decomposed into smaller parts - Assess ownership and responsibility for problem resolution

19 Intelligence Phase( Contd…)
- Automatic - Data Mining - Expert systems, CRM, neural networks - Manual - OLAP - KMS - Reporting - Routine and ad hoc

20 Decision-Making Design Phase
Develop alternative courses of action Analyze potential solutions Create model Test for feasibility Validate results Select a principle of choice Establish objectives Incorporate into models Risk assessment and acceptance Criteria and constraints

21 Design Phase (Contd…) Design Phase - Financial and forecasting models
- Generation of alternatives by expert system - Relationship identification through OLAP and data mining - Recognition through KMS - Business process models from CRM and ERP etc…

22 Decision-Making Choice Phase
Principle of choice - Describes acceptability of a solution approach Normative Models - Optimization Effect of each alternative Rationalization More of good things, less of bad things Courses of action are known quantity Options ranked from best to worse Suboptimization Decisions made in separate parts of organization without consideration of whole

23 Choice Phase (Contd...) Decision making with commitment to act
Determine courses of action Analytical techniques Algorithms Heuristics Blind searches Analyze for robustness

24 Choice Phase (Contd…) Choice Phase Identification of best alternative
Identification of good enough alternative What-if analysis Goal-seeking analysis May use KMS, GSS, CRM, and ERP systems

25 Decision-Making Implementation Phase
Putting solution to work Vague boundaries which include: Dealing with resistance to change User training Upper management support

26 Implementation Phase (Contd…)
Improved communications Collaboration Training Supported by KMS, expert systems, GSS

27 Developing Alternatives
Generation of alternatives May be automatic or manual May be legion, leading to information overload Scenarios Evaluate with heuristics Outcome measured by goal attainment

28 Descriptive Models Describe how things are believed to be
Typically, mathematically based Applies single set of alternatives Examples: Simulations What-if scenarios Cognitive map Narratives

29 Problems Satisfying is the willingness to settle for less than ideal.
Form of sub optimization Bounded rationality Limited human capacity Limited by individual differences and biases Too many choices

30 Source: Based on Sprague, R. H. , Jr
Source: Based on Sprague, R.H., Jr., “A Framework for the Development of DSS.” MIS Quarterly, Dec. 1980, Fig. 5, p. 13.

31 Decision-Making in humans
Cognitive styles What is perceived? How is it organized? Subjective Decision styles How do people think? How do they react? Heuristic, analytical, autocratic, democratic, consultative


33 DSS as a methodology A DSS is a methodology that supports decision-making. It is: Flexible; Adaptive; Interactive; GUI-based; Iterative; and Employs modeling.

34 `

35 Business Intelligence
Proactive Accelerates decision-making Increases information flows Components of proactive BI: Real-time warehousing Exception and anomaly detection Proactive alerting with automatic recipient determination Seamless follow-through workflow Automatic learning and refinement

36 Components of DSS Subsystems: Data management Model management
Managed by DBMS Model management Managed by MBMS User interface Knowledge Management and organizational knowledge base


38 Data Management Subsystem
Components: Database Database management system Data directory Query facility


40 Levels of decision making
Strategic Supports top management decisions Tactical Used primarily by middle management to allocate resources Operational Supports daily activities Analytical Used to perform analysis of data

41 (ad hoc analysis)

42 DSS Classifications GSS v. Individual DSS
Decisions made by entire group or by lone decision maker Custom made v. vendor ready made Generic DSS may be modified for use Database, models, interface, support are built in Addresses repeatable industry problems Reduces costs


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