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Transcript of 1010 chapter10
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ITEC 1010 Information and Organizations
Chapter 10
Decision Support Systems
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ITEC 1010 Information and Organizations
Decision Support Systems
Decision support systems (DSS) Offer potential to assist in solving both semi-
structured and unstructured problems
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ITEC 1010 Information and Organizations
Decision Making as a Component of Problem Solving
Intelligence
Design
Choice
Implementation
Monitoring
Problemsolving
Decisionmaking
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ITEC 1010 Information and Organizations
Solution Types
Optimization model Finding the best solution
Satisficing model Finding a good -- but not necessarily the best
-- solution to a problem Heuristics
Commonly accepted guidelines or procedures that usually find a good solution
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ITEC 1010 Information and Organizations
Problem Solving Factors
Multiple decision objectives Increased alternatives Increased competition The need for creativity Social and political actions International aspects Technology Time compression
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ITEC 1010 Information and Organizations
Characteristics of a DSS (1)
Handles large amounts of data from different sources
Provides report and presentation flexibility Offers both textual and graphical
orientation
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ITEC 1010 Information and Organizations
Characteristics of a DSS (2)
Supports drill down analysis Performs complex, sophisticated analysis
and comparisons using advanced software packages
Supports optimization, satisficing, and heuristic approaches
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ITEC 1010 Information and Organizations
Characteristics of a DSS (3)
Performs different types of analyses “What-if” analysis
• Makes hypothetical changes to problem and observes impact on the results
Simulation• Duplicates features of a real system
Goal-seeking analysis• Determines problem data required for a given result
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ITEC 1010 Information and Organizations
Goal Seeking Example
You know the desired result You want to know the required input(s) Example:
Microsoft Excel’s “Goal Seek” and “Solver” functions
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ITEC 1010 Information and Organizations
Exceldemo
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ITEC 1010 Information and Organizations
Capabilities of a DSS (1)
Supports Problem solving phases Different decision frequencies
Frequencylow high
Merge withanother
company?
How many widgets
should I order?
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ITEC 1010 Information and Organizations
Capabilities of a DSS (2)
Highly structured problems Straightforward problems, requiring known
facts and relationships.
Semi-structured or unstructured problems Complex problems wherein relationships
among data are not always clear, the data may be in a variety of formats, and are often difficult to manipulate or obtain
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ITEC 1010 Information and Organizations
Decision Making Levels
Operational-levelmanagers involved withdaily decisions
Strategic-level managersinvolved with long-term
decisions
LowHigh
Decision Frequency
Strategic
Tactical
Operational
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ITEC 1010 Information and Organizations
Integration ofTPS, MIS, and DSS
In many organizations they are integrated through a common database
Separation of DSS transactions in the database from TPS and MIS transactions may be important for performance reasons
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ITEC 1010 Information and Organizations
Web-Based Decision Support Systems
Web-based decision support systems Decision support system software provides
business intelligence through web browser clients that access databases either through the Internet or a corporate intranet
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ITEC 1010 Information and Organizations
Components of a DSS
Model management software (MMS) Coordinates the use of models in the DSS
Model base Provides decision makers with access to a
variety of models Dialogue manager
Allows decision makers to easily access and manipulate the DSS
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ITEC 1010 Information and Organizations
Database Model base
External databaseaccess
Access to theinternet, networks,and other computersystems
Dialogue manager
DBMS MMS
Externaldatabases
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ITEC 1010 Information and Organizations
Model Base
Model Base Provides decision makers with
access to a variety of models and assists them in decision making
Models Financial models Statistical analysis models Graphical models Project management models
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ITEC 1010 Information and Organizations
Advantages and Disadvantagesof Modeling
Advantages• Less expensive than custom approaches or real systems.• Faster to construct than real systems• Less risky than real systems• Provides learning experience (trial and error)• Future projections are possible• Can test assumptions
Disadvantages• Assumptions about reality may be incorrect• Accuracy of predications often unreliable• Requires abstract thinking
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ITEC 1010 Information and Organizations
Group Decision Support System
Group Decision Support System (GDSS) Contains most of the elements of DSS plus
software to provide effective support in group decision-making settings
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ITEC 1010 Information and Organizations
Databases
Model base GDSS processor GDSS software
Dialoguemanager
External databaseaccess
Users
Access to the internetand corporate intranet,
networks, and othercomputer system
Externaldatabases
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ITEC 1010 Information and Organizations
Characteristics of a GDSS (1)
Special design Ease of use Flexibility Decision-making support
Delphi approach (decision makers are geographically dispersed)
Brainstorming Group consensus Nominal group technique
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ITEC 1010 Information and Organizations
Characteristics of a GDSS (2)
Anonymous input Reduction of negative group behaviour Parallel communication Automated record keeping Cost, control, complexity factors
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ITEC 1010 Information and Organizations
Group Results Matrix
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ITEC 1010 Information and Organizations
Components of a GDSS and GDSS Software
Database Model base Dialogue manager Communication capability Special software (also called GroupWare) E.g., Lotus Notes
people located around the world work on the same project, documents, and files, efficiently and at the same time
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ITEC 1010 Information and Organizations
GDSS Alternatives
Local areadecision network
Wide areadecision network
Decisionroom
Teleconferencing
Location of group members
close distant
high
low
Dec
isio
n fr
eque
ncy
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ITEC 1010 Information and Organizations
Decision Room
Decision Room For decision makers located in the same geographic
area or building Use of computing devices, special software,
networking capabilities, display equipment, and a session leader
Collect, coordinate, and feed back organized information to help a group make a decision
Combines face-to-face verbal interaction with technology-aided formalization
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ITEC 1010 Information and Organizations
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ITEC 1010 Information and Organizations
Wide Area Decision Network
Characteristics Location of group members is distant Decision frequency is high Virtual workgroups
• Groups of workers located around the world working on common problems via a GDSS
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ITEC 1010 Information and Organizations
Executive Support System
Characteristics A specialized DSS that
includes all the hardware, software, data, procedures, and people used to assist senior-level executives within the organization
Board of directors
President
Function areavice presidents
Function areamanagers
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ITEC 1010 Information and Organizations
Characteristics of ESSs
Tailored to individual executives Easy to use Drill down capabilities Support the need for external data Help with situations with high degree of
uncertainty Futures orientation (predictions, forecasting) Linked with value-added business processes
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ITEC 1010 Information and Organizations
Capabilities of an ESS
Support for defining overall vision strategic planning strategic organizing and staffing strategic control crisis management
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ITEC 1010 Information and Organizations
End of Chapter 10
Chapter 11