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