Summary
Summary PERT/CPM
- Course
- Comm 223 (COMM223)
- Institution
- Concordia University ( )
DETAILED CLASS NOTES FOR PERT / CPM L2 CH 17
[Show more]
Seller
Follow
Content preview
PERTSaturday, January 23, 2021 6:16 PM
PROBABILISTIC TIME ESTIMATES
- Beta distribution used to describe variability in activity durations
- The main determinant of the way CPM/PERT networks are used is
whether activity/work package durations are probabilistic or
deterministic
Three point estimate methods
- The probabalistic PERT/CPM approach that incolved 3 duration
estimates for each activity/work package instead of one:
• Optimistic time = t0
○ The length of time required under optimal
conditions
• Most likely time = tm
○ The most probable length of time required
○ Time required in most common or normal
conditions
• And pessimistic time = tp
○ The length of time required under the worst
conditions
○ Under most commonly disadvantageous
situations
BETA DISTRIBUTION
- Continuous positive distributions used to describe variability
- Path duration distribution is approximately a normal distribution
-
,
, BETA DISTRIBUTION
- Continuous positive distributions used to describe variability
- Path duration distribution is approximately a normal distribution
-
EXPECTED TIME Te
- Once you have the probabilistic time estimates can compute the mean
time:
- Te = weighted averge of the 3 time estimates
-
- Expected duration of a path = sum of the expected times of the
activities on that path
-
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller chiicago09. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$11.13. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79107 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now