Snow plowing scenario: Local records show 20 full days of snow plowing on average per winter; this winter there were 45 days. For the 45 days, the contractor was on critical path. In the last 15 of those days, equipment broke preventing work. How many days of time extension is the contractor entitled to?

• A. 0 days
• B. 5 days
• C. 10 days
• D. 20 days

Answer: (C)

The main idea is to separate delays caused by weather from other delays and measure how many weather-related days exceed the normal, or baseline, weather impact.

Out of the 45 days on the critical path, 15 days were lost to equipment breakdown, so only 30 days were weather-related. The local record shows that, on average, weather would limit work to 20 days in a winter. Since there were 30 weather-related delay days, the excess over the average is 10 days. Those 10 days are the time extension the contractor would be entitled to.