What Are Units?
• A resource’s capacity to perform work
– Possible units:
• 50% (half time)
• 100% (full time) DEFAULT VALUE
• 300% (HUH?)
– Three people!
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
An estimate for digging the hole is 15 minutes.
Checking the Default Units
MS Project assumes 100% commitment to the task as the default
Back to Digging the Hole…
Since Work = Duration X Units
Work = 15 minutes x 100%
Work = 15 minutes
Easy so far!
Sticking With Fixed Units
Increasing the duration should increase work
Increasing the Duration Estimate
INCREASED the work!
Decreasing the Duration Estimate
Decreased the work!
LET’S MESS WITH MS PROJECT
WE’LL CHANGE WHAT IS CONSTANT
UN I TS!
Changing The Units
From 100% Capacity to work
To 50% capacity to work
Work stayed the same, but duration doubled.
Work = Duration ×Units
.25 hours = Duration × 0.50
Duration = .25 hours
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