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Computer Aided Process Computer Aided Process PlanningPlanning
What is CAPPWhat is CAPP
Process PlanProcess Plan
Process PlanningProcess Planning
Basic Process in developing Basic Process in developing a process plana process plan
Process Planning Process Planning ApproachesApproaches
Manual SystemsComputer Aids
◦Variant System◦Experimental Generative System
Manually Prepared Manually Prepared Process PlansProcess Plans
Computer AidsComputer Aids
Variant (Retrieval) CAPP Variant (Retrieval) CAPP MethodologyMethodology
Variant CAPPVariant CAPP
Variant CAPPVariant CAPP
Variant CAPPVariant CAPP
Generative CAPP Generative CAPP MethodologyMethodology
Knowledge based process Knowledge based process planningplanning
Kendall & Kendall 9-16
Decision Tables
• A table of rows and columns, separated into four quadrants• Conditions• Condition alternatives• Actions to be taken• Rules for executing the actions
Kendall & Kendall 9-17
Figure 9.8 The standard format used for presenting a decision table
Kendall & Kendall 9-18
Developing Decision Tables
• Determine conditions that affect the decision• Determine possible actions that can be taken• Determine condition alternatives for each
condition• Calculate the maximum number of columns in
the decision table• Fill in the condition alternatives• Complete table by inserting an X where rules
suggest actions• Combine rules where it is apparent • Check for impossible situations• Rearrange to make more understandable
Kendall & Kendall 9-19
Figure 9.10 Constructing a decision table for deciding which catalog to send to customers who order only from selected catalogs
Kendall & Kendall 9-20
Checking for Completeness and Accuracy
• Four main problems• Incompleteness• Impossible situations• Contradictions• Redundancy
Kendall & Kendall 9-21
Figure 9.14 Checking the decision table for inadvertent contradictions and redundancy is important
Types of Decision TableTypes of Decision Table