Labor Productivity

H = \frac{Q}{p} t = \frac{H}{n}

Required labor-hours H equal quantity Q divided by production rate p (units per labor-hour). Crew duration t is H divided by crew size n. Overtime and weather factors multiply H. Stay consistent with the definition of p.

$Q$: Quantity
$p$: Production per labor-hour
$H$: Labor-hours
$n$: Crew size

Step-by-step solved example

Place 480 cy. Production p = 3 cy per labor-hour, crew n = 4. Duration?

Crew output vs the activity duration on the network.

1. Labor-hours
H = 480/3 = 160 labor-hours.
2. Duration
t = 160/4 = 40 crew-hours.
$t = 40 h$

Answer: 160 labor-h, 40 crew-h

10 practice questions

0/10 correct

1.p = 8 sf/lh, Q = 400 sf. H =

2.A 5-person crew, 50 lh total. Duration =

3.Learning curve means later units take

4.Weather factor 1.20 multiplies

5.If p doubles, duration for fixed Q and crew

6.Unit cost of labor = wage ×

7.Overtime often

8.Q = 90 cy, p = 15 cy/lh, n = 3. Calendar hours =

9.If p is given per crew-hour, do not

10.Quantity takeoff feeds