CRAFTCRAFT

Computerized Relative Computerized Relative Allocation of Facilities Allocation of Facilities TechniqueTechnique

What Will Be CoveredWhat Will Be Covered

• Definition of CRAFTDefinition of CRAFT• BrainstormingBrainstorming• Nuts and BoltsNuts and Bolts• How it WorksHow it Works• An ExerciseAn Exercise• Summary Summary • Reading ListReading List

CRAFT DefinedCRAFT Defined

• Created in 1964 by Buffa and Created in 1964 by Buffa and ArmourArmour

• Process layout approachProcess layout approach• A heuristic computer programA heuristic computer program

– Compares process departmentsCompares process departments

Brainstorming ExerciseBrainstorming Exercise

Think of the amount of handling a Think of the amount of handling a product will have from one product will have from one department to another in your department to another in your company.company.

Does the product have to travel Does the product have to travel across many departments to get to across many departments to get to the next step in the process?the next step in the process?

End TaskEnd Task

• Minimize Transportation CostsMinimize Transportation Costs• Improve Work FlowImprove Work Flow• Utilize labor efficientlyUtilize labor efficiently• Utilize space efficientlyUtilize space efficiently• Eliminate bottlenecksEliminate bottlenecks

Nuts and BoltsNuts and BoltsInitial LayoutInitial Layout

• Initial Layout of DepartmentsInitial Layout of Departments

• Dept ADept A• Dept BDept B• Dept CDept C• Dept DDept D• Dept EDept E

A A A B B B

A A A B B B

C C C B B B

C C C D D D

E E E E E E

E E E E E E

Nuts and Bolts Nuts and Bolts From-To ChartFrom-To Chart

From \ To D E PA R T M E N T

Department 1 2 3 4 51 - 100 50

2 - 200 50

3 60 - 40 50

4 100 - 60

5 50 -

Nuts and BoltsNuts and BoltsFrom-To ChartFrom-To Chart

• Determines which of the two Determines which of the two departments has a better from-to departments has a better from-to matrix, we can calculate the matrix, we can calculate the momentmoment of the matrix as follows: of the matrix as follows:

fd ijji

ijMoment

),(

matrix in theentry j) (i, the

diagonal thefromentry j) (i, theof distance

where

fd

ij

ij

Nuts and BoltsNuts and BoltsBlock DiagrammingBlock Diagramming

Initial DiagramInitial Diagram Final DiagramFinal Diagram

Benefits and ProblemsBenefits and Problems

• BenefitBenefit– A Computer ProgramA Computer Program– FlexibiltyFlexibilty

• ProblemsProblems– Greedy AlgorithmGreedy Algorithm– InefficientInefficient– End result may need to be modifiedEnd result may need to be modified

An ExerciseAn Exercise

From-To ChartFrom-To ChartFrom \ To D E PA R T M E N T

Department A B C D EA - 100 50

B - 200 50

C 60 - 40 50

D 100 - 60

E 50 -

An Exercise cont’dAn Exercise cont’d

Initial LayoutInitial Layout

A A A B B B

A A A B B B

C C C B B B

C C C D D D

E E E E E E

E E E E E E

SummarySummary

It is beneficial to use CRAFT but you It is beneficial to use CRAFT but you should also realize that the should also realize that the program is not flawless. program is not flawless.

The user must understand how the The user must understand how the program works of the end product program works of the end product is not as efficient as you had hope.is not as efficient as you had hope.

BibliographyBibliography

• http://www.cbpa/ewu/edu/~pnemetzmills/OMch7/OM07Fhttp://www.cbpa/ewu/edu/~pnemetzmills/OMch7/OM07FAC.htmlAC.html

““Operations management-Focusing on Quality and Operations management-Focusing on Quality and Competitiveness”Competitiveness”

• http://203.162.139.22/kinhte/qtsp_hd/english/pom6.http://203.162.139.22/kinhte/qtsp_hd/english/pom6.htmhtm “POM 6”“POM 6”

• http://www.nvgc.rt.edu/bhoopes/5414/layout.pdfhttp://www.nvgc.rt.edu/bhoopes/5414/layout.pdf

““Facility Layout”Facility Layout”• ““Layout Design and Analysis Software” Layout Design and Analysis Software” IIE SolutionsIIE Solutions

magazine. 1996. Grajo, Eric s. Montreuil, Benoit. Sly, magazine. 1996. Grajo, Eric s. Montreuil, Benoit. Sly, Dave.Dave.

• http://www.pitt.edu/~banwork/1055/ch8.doc “CRAFT”http://www.pitt.edu/~banwork/1055/ch8.doc “CRAFT”

BibliographyBibliography

• http://www.cen/uiuc.edu/courses/ie261/notes/layout/http://www.cen/uiuc.edu/courses/ie261/notes/layout/layout-Computer-2.html “Computerized Relative layout-Computer-2.html “Computerized Relative Allocation of Facilities Technique - CRAFT”Allocation of Facilities Technique - CRAFT”

• http://www.cen/uiuc.edu/courses/ie261/notes/layout/http://www.cen/uiuc.edu/courses/ie261/notes/layout/layout-Measurin.html “Measuring Flow”layout-Measurin.html “Measuring Flow”

• http://www.set.usm.edu/Bcoates/iet409class_7.htmlhttp://www.set.usm.edu/Bcoates/iet409class_7.html

““IET 409 Plant Layout Class Notes – Chapter 7”IET 409 Plant Layout Class Notes – Chapter 7”• http://www.nist.gov/dads/HTML/greedyalgo.html “greedy http://www.nist.gov/dads/HTML/greedyalgo.html “greedy

algorithm”algorithm”