Hi All,

  Can someone just explain to me the below questions.


An activity has an early start (ES) of day 3, a late start (LS) of day 13, an early finish (EF) of day g, and a late finish (LF) of day ig. The activity:

  1. is on the critical path.
  2. has a lag.
  3. is progressing well.
  4. is not on the critical path.

Answer D




If there is a difference between early start date and late start date that means the activity has a FLOAT and is not on critical path.


1 def not on Critical path else there would be float of 0 or negative not +10 days

2 Def does not have a lag. Lag is the relationship between 2 activities and the relationship between sucessor or predecessor is not exaplained here

3 can be rules out since we don't know if its progressing well

Perfect way of answering a question. No wonder you pased the exam.

Answer is D. The Q has a typo. Most probably the Q should should read 9 & 19 as the late dates. But late dates are not required to answer the Q.You can read more about it in the following article - 19 Frequently Asked Questions on the Critical Path Method