engineering management tidbits! © washington state university-20141 [email protected] james r. holt,...

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Engineering Management Tidbits! © Washington State University- 2014 1 [email protected] http://etm.wsu.edu/ James R. Holt, Ph.D., PE Professor Engineering Management Buffer Management in Projects A Game using Critical Chain Project Management. View this documen t in Slide- Show mode.

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Engineering Management Tidbits!

© Washington State University-2014 1

[email protected]://etm.wsu.edu/

James R. Holt, Ph.D., PEProfessor

Engineering Management

Buffer Management in Projects

A Game using Critical Chain Project Management.

View this document in Slide- Show mode.

Preparations for Game Director:

2

Printing Sheets for Manual CCPM Buffer Management Game Print pages 13-16 on card stock (one set per team).-- One slide is the initial project (before CCPM leveling)-- One slide is the Tasks sized at 1” per week with some too-long buffers they can cut to size.-- One slide is a Percent Calculator sheet (so you don’t need calculators)-- One slide is the Fever Chart for tracking the Buffer Status of projects over time. Give each team a pair of scissors so they can cut out their own pieces from slide 14.Use 1” square grid Easel Paper to arrange the projects.You will need some tape to stick down the buffers (there rest of the tasks will move during simulation).

Note: There is a second, small project at the end (slides 18-19) if you want another example (though more difficult to schedule) to schedule before or after your larger project. There are Extra Buffer strips at slide 20.

3

Project BufferFeeder Buffer

-80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 0

A315

A210

C315

A15

B210

B310

A410

A510

A615

B45

C410

D320

D45

C75

C615

Project Complete

Original Project(Before CCPM Leveling)

The times are already Aggressive (50% estimates).

Days 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75

Weeks 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Your Plan (Task durations are Aggressive Times)

• Cut out and Lay out your plan using the colored strips provided on a large sheet of graph paper (Scale 1” Square is 5 days).

• Remove conflicts between resources.

• Select the Critical Chain.

• Add a Project Buffer.

• Insert needed Feeder Buffers.

• Adjust the schedule if needed.

• Determine your Promised Delivery Date (the Number the weeks of your project from 1 to the end of the Project Buffer).

• Tape down the Buffers (they don’t move).

• Assign individuals to Resource Colors (one person per Color)

4

A315

C410

D45

A15

B210

A510

C75

C315

B310

D320

A410

A615

B45

C615

Project Buffer

Feeder Buffer

A210

To play!

5

Each week, Resources which have work will work on their own active tasks.

(A week is 5 days or one square on the paper)

Each Resource can only work on one task at a time. Select the active task for that resources (a task that has all preceding work completed) before starting to roll.

The Resource rolls one fair die once each day (for a maximum of five days per week) to determine if the Task is complete or not during that week (it’s binary, the resource either completes the tasks that week or not). If the Resource rolls a Six during the five day week, one weeks worth of work is completed for the active task. If no Six is rolled after five rolls (by the end of the week) that task slides (moves) to the right one square and pushes any follow-on work ahead – to the right (usually into the Project Buffer).(Note: If the Resource rolls a Six early in the week AND there is currently additional active work for that same Resource immediately available, then that Resource can spend the rest of the week working on a second, or even third task during the same week up to the maximum five rolls per week.)

Management Decisions

6

The goal is to complete your project by the delivery date you promised. Use Buffer Management to determine the best place and time to use your resources.

NOTE:•Your Project Manager has ONE extra Die that can be used to assist any Resource for one week at a time. This is like “Over-Time” for that resource for a week. The extra die can be assigned at the beginning of the week and rolls five times during the week along with the color Resource working overtime that week. The number of sixes rolled by the resource and the extra die are both counted towards completion of that Resource’s Task for that week.•The Project Manager keeps track of the Number of Weeks the Extra Die was used.

7

How the Time Clock Moves Along ….

Project BufferFeeder Buffer

-80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 0

A315

A210

C315

A15

B210

B310

A410

A510

A615

B45

C410

D320

D45

C75

C615

Project Complete

Moving TimeLine

End of Week1

End of Week2

End of Week3

End of Week4

End of Week5 …

Each week, move your current Time Line

Days 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75

Weeks 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Feeder Buffer

Note: This is not a good CCPM schedule. It’s just thrown in here to show the movements of time.

8

How the Project Might Look Over the Length of the Project

Project Buffer

A315

A210

A15

B210

B310

A615

B45

D320

C75

Project Complete

Moving TimeLine

Each week, move your current Time Line

Days 0 5 10 15 20 25 30 35 40 120 125 130 135 140 145 150

Weeks 0 1 2 3 4 5 6 7 8 24 25 26 27 28 29 30

Feeder Buffer

FB

Note: This is not a good CCPM schedule. It’s just thrown in here to show the movements of time.

9

This is how it might look over time.

Project Buffer

A315

A210

A15

B210

B310

A615

B45

D320

C75

Project Complete

Moving TimeLine

End of Week1

Each week, move your current Time Line

Days 0 5 10 15 20 25 30 35 40 120 125 130 135 140 145 150

Weeks 0 1 2 3 4 5 6 7 8 24 25 26 27 28 29 30

Feeder Buffer

FB

Week 1 Blue Rolls one six in 5 days

Note: This is not a good CCPM schedule. It’s just thrown in here to show the movements of time.

10

This is how it might look over time.

Project Buffer

A315

B210

B310

A615

B45

D320

C75

Project Complete

Moving TimeLine

End of Week2

Each week, move your current Time Line

Days 0 5 10 15 20 25 30 35 40 120 125 130 135 140 145 150

Weeks 0 1 2 3 4 5 6 7 8 24 25 26 27 28 29 30

Feeder Buffer

FB

Week 2 Blue Rolls no six in 5 days

A210

A15

Note Feeder Buffer Consumption

Note: This is not a good CCPM schedule. It’s just thrown in here to show the movements of time.

11

This is how it might look over time.

Project Buffer

A315

B210

B310

A615

B45

D320

C75

Project Complete

Moving TimeLine

End of Week3

Each week, move your current Time Line

Days 0 5 10 15 20 25 30 35 40 120 125 130 135 140 145 150

Weeks 0 1 2 3 4 5 6 7 8 24 25 26 27 28 29 30

Feeder Buffer

FB

Week 3 Blue Rolls no six in 5 days

A210

A15

Note Feeder Buffer ConsumptionNote Project Buffer Consumption

Note: This is not a good CCPM schedule. It’s just thrown in here to show the movements of time.

12

This is how it might look over time.

Project Buffer

A315

B210

B310

A615

B45

D320

C75

Project Complete

Moving TimeLine

End of Week4

Each week, move your current Time Line

Days 0 5 10 15 20 25 30 35 40 120 125 130 135 140 145 150

Weeks 0 1 2 3 4 5 6 7 8 24 25 26 27 28 29 30

Feeder Buffer

FB

Week 4 Blue Rolls two sixes in 5 days

A210

A15

Note Feeder Buffer ConsumptionNote Project Buffer Regained

Note: This is not a good CCPM schedule. It’s just thrown in here to show the movements of time.

13

Project BufferFeeder Buffer

-80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 0

A315

A210

C315

A15

B210

B310

A410

A510

A615

B45

C410

D320

D45

C75

C615

Project Complete

Original Project(Before CCPM Leveling)

The times are already Aggressive (50% estimates).

Days 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75

Weeks 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

A315

C410

D45

A15

B210

A510

C75

C315

B310

D320

A410

A615

B45

C615

Project Buffer

Feeder Buffer

Feeder Buffer

<--A2

-->A4

<--B2

-->D4

-->A5

-->B4

<--B3

<--C3

-->C6

-->C6

<--D3

<--a5

-->C7

<--C4D4

-->A5

<--A3

-->A6

<--A3B4

-->C4

-->A2

-->B3

<--C6

A210

<--A1

-->A3

Feeder BufferLarge Project

LPLP

LP

LP

LP LP

LP LP

LP

LP LP

LP

LPLP

LP

Percentage Calculation Chart

Weeks 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20Weeks Days 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100

1 5 0100 2 10 0 50 100 3 15 1 33 67100 4 20 2 25 50 75 100 5 25 3 20 40 60 80 100 6 30 4 17 33 50 67 83 100 7 35 5 14 29 43 57 71 86100 8 40 6 13 25 38 50 63 75 88 100 9 45 7 11 22 33 44 56 67 78 89100

10 50 8 10 20 30 40 50 60 70 80 90 100 11 55 9 9 18 27 36 45 55 64 73 82 91100 12 60 10 8 17 25 33 42 50 58 67 75 83 92100 13 65 11 8 15 23 31 38 46 54 62 69 77 85 92 100 14 70 12 7 14 21 29 36 43 50 57 64 71 79 86 93100 15 75 13 7 13 20 27 33 40 47 53 60 67 73 80 87 93100 16 80 14 6 13 19 25 31 38 44 50 56 63 69 75 81 88 94 100 17 85 15 6 12 18 24 29 35 41 47 53 59 65 71 76 82 88 94100 18 90 16 6 11 17 22 28 33 39 44 50 56 61 67 72 78 83 89 94 100 19 95 17 5 11 16 21 26 32 37 42 47 53 58 63 68 74 79 84 89 95 100 20 100 18 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100

Example: If the Critical Chain time is 80 days and you have completed 50 of the Critical Chain days, then you have completed 63% of the Critical Chain.

Use this row for 80 days.

Example: If the Project Buffer is 40 days, and you have consumed 15 days of Buffer, then you have consumed 38% of your Buffer.

Use this row for 40 days.

Fever Chart

Go!

17

Week 1

Week 2

Week 3

Week 4

Week 5

Week 6

Week 7

Week 8

Week 9

Week 10

Week 11

Week 12

Week 13

Week 14

Week 15

Week 16

Week 17

Week 18

Week 19

Week 20

Week 21

Week 22

Week 23

Week 24

Week 25

Week 26

Week 27

Week 28

Week 29

Week 30

Week 31

Week 32

Week 33

Week 34

Week 35

Week 36

Week 37

Week 38

Week 39

Week 40 (Use this animated slide to keep teams all on the same week).

Small Project

A-215

A-410

C-215

C-45

B-610

E-215

G-215

G-415

F-65

E-45

Project Complete

C-215

F-65

Project Buffer

Feeder Buffer

-->C-4

<--E-4G-4

A-410

-->B-6

Feeder BufferSmall Project

SP

SP

C-45

-->B-6

E-45

-->F-6

E-215

-->E-4

SP

G-415

<--G-2

-->F-6

SP

B-610

<--A-4C-4

A-215

SP

G-215

SP

<--A-2

<--C-2

<--E-2

-->A-4

-->G-4

SP

SP

SP SP

Project Buffer

Project Buffer

Project Buffer

Feeder Buffer

Feeder Buffer

Feeder Buffer

Feeder BufferA few extra Buffer Strips