What is IS? P. Pete Chong Martel Corp Prof of CIS University of Houston-Downtown.
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Transcript of What is IS? P. Pete Chong Martel Corp Prof of CIS University of Houston-Downtown.
What is IS?
P. Pete ChongMartel Corp Prof of CIS
University of Houston-Downtown
What is Information?
Supports Decision Anything that does not support
decision is only data What is Decision? Why Decision?
Must Come Out Ahead
Profit = Revenue - Cost Profit = Benefit - Cost The goal is to increase profit, not just
to decrease cost or increase benefit
Rational Decisions
For Profit > 0, Benefit/Cost > 1 This ratio makes a RATIOnal decision Decision can then be reduced to:
IF (B/C > 1) THEN
Do
ELSE
Don’t Do
ENDIF
Wrong Decisions?
IF (Value > Threshold) THEN… Use wrong decision criteria False assessment of values
IF(B/C > 1) THEN… Benefit = Bij P(Bij)
Cost = Cij P(Cij)
Information System IS Decision Support System
Management: Allocation of Resources Information: Data Analysis Systems: Information Technology
(narrow), Organization Restructure (broad)
Pete’s Pet Rules
The 70% Rule The 5% Rule Modular Combination The 80/20 Rule
The 70% Rule
Benefit to self comes from benefit to clients – customer-centered approach
The 5% Rule
Things are processed only 5% of time – increase productivity by reduce waiting time
Modular Combination
Any solution is a combination of existing solutions
The 80/20 Rule
Significant Few vs. Trivial Many
System Development Life Cycle (SDLC)
Enterprise View Requirements Analysis Logical Design Physical Design Implementation/Testing
Enterprise View
Define goals
Requirements Analysis
What does it take? Identify Critical Success Factors from
interview, and study documents and forms.
Logical Design
Organize by relevance and usage Create a “system on paper” Assume “prefect technology”
Physical Design
Find the “right” tools Modify LD result to fit reality
Implementation and Testing
Coding and testing
Benefits of Using SDLC
Separation of Managerial Issues from Technological Issues
Results of Logical Design is stable (change little over time) and portable (may be implemented using many different tools)
Effectiveness vs. Efficiency
Goal definition and factor identification are effectiveness issues
ORGANization is an efficiency issue
IS Impact: Value Chain View
Inbound Logistic Process Outbound Logistic Marketing and Sales Customer Service
IS Impact: SDLC View
Automation Rationalization Reengineering Paradigm Shift
Automation
Standard Operation Procedures Quick and measurable benefit
Rationalization
Streamlining the process Remove unnecessary steps With automation and increased
reliability, the elimination of monitoring system (source of security problems?)
Reengineering
Accomplish the same goal with different means
Replace qualitative decision criteria with quantitative ones
Paradigm Shift
Changing goals, either contract or expand