Digging A Hole
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The document discusses how Microsoft Project calculates work for a task by multiplying duration by units. It provides examples showing that when duration is changed but units remain at the default of 100%, work changes proportionally. However, when units are changed to 50% while keeping work fixed, duration must increase to compensate in order to perform the same amount of work over a longer period of time at reduced capacity. In other words, work remains fixed while duration varies inversely with units.
Digging A Hole
- 1. Digging a hole Microsoft Project Style
- 2. How much work does it take to dig a hole to plant a rose bush?
- 3. Work = Duration X Units
- 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. 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. MS Project Default Which Means…
- 8. An estimate for digging the hole is 15 minutes.
- 9. Checking the Default Units MS Project assumes 100% commitment to the task as the default
- 10. Back to Digging the Hole… Since Work = Duration X Units Work = 15 minutes x 100% Work = 15 minutes Easy so far!
- 11. Sticking With Fixed Units Increasing the duration should increase work
- 12. Increasing the Duration Estimate INCREASED the work!
- 13. Decreasing the Duration Estimate Decreased the work!
- 14. LET’S MESS WITH MS PROJECT WE’LL CHANGE WHAT IS CONSTANT UN I TS!
- 15. Changing The Units From 100% Capacity to work To 50% capacity to work
- 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