a

Average fraction of workday spent on administrative or other indirect work

t

Average duration of working interrupts (minutes)

r

Average recovery time after interruptions (minutes)

k

Number of interruptions/workday from project personnel

p

Number of interruptions/workday from non-project personnel

i

Indirect (overhead) cost/person expressed as fraction of base pay

d

Differential pay for overtime expressed as fraction of base pay

n

Number of people working in the project

g

Average number of overtime workhours per workday

Parameter

Range

Factory Workers

Programmers

Optimistic

Typical

Pessimistic

a

0 - 0,5

0.0

0.05

0.10

0.15

t

1 - 20

3

3

5

10

r

0.5 - 10

0.5

0.5

2.0

8.0

k

1 - 10

1

2

3

4

p

1 - 10

1

1

4

10

i

0.1 - 3

0.2

0.2

0.5

1.5

d

1 - 2

1.5

1

1

1.5

ratio of calendar time to person-days to complete the project

labor cost per work day for an average base salary s

cost efficiency

Project cost per person-day