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# Digging A Hole

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Playing around with the "scheduling engine" inside of MS Project 2007.

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### Digging A Hole

1. 1. Digging a hole Microsoft Project Style
2. 2. How much work does it take to dig a hole to plant a rose bush?
3. 3. Work = Duration X Units
4. 4. What Are Units? • A resource’s capacity to perform work – Possible units: • 10% • 50% (half time) • 100% (full time) DEFAULT VALUE • 300% (HUH?) – Three people!
5. 5. How is Work Expressed? • Work = Duration x Units • Work = Hours x Percentage of effort • Therefore work is expressed in hours – Unfortunately, so is duration Work is expressed hours Duration is expressed in hours Units are expressed as a percentage
6. 6. MS Project Default Which Means…
7. 7. A Simple Proof
8. 8. An estimate for digging the hole is 15 minutes.
9. 9. Checking the Default Units MS Project assumes 100% commitment to the task as the default
10. 10. Back to Digging the Hole… Since Work = Duration X Units Work = 15 minutes x 100% Work = 15 minutes Easy so far!
11. 11. Sticking With Fixed Units Increasing the duration should increase work
12. 12. Increasing the Duration Estimate INCREASED the work!
13. 13. Decreasing the Duration Estimate Decreased the work!
14. 14. LET’S MESS WITH MS PROJECT WE’LL CHANGE WHAT IS CONSTANT UN I TS!
15. 15. Changing The Units From 100% Capacity to work To 50% capacity to work
16. 16. What Happened? Work stayed the same, but duration doubled. FIXED WORK! Work = Duration ×Units .25 hours = Duration × 0.50 Duration = .25 hours 0.50 Duration = .5 hours The same amount of work needs to be done, but at a 50% dedication, it will take twice as long. Dave is annotated with 50% units