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# TOPIC: 1 or 0 to start path the critical path

## 1 or 0 to start path the critical path 4 years 9 months ago #4821

 James Whelan Topic Author Offline Fresh Boarder Posts: 9 Thank you received: 2 Will both methods to start the critical path be on the PMP? Rita starts with 0 and PMBOK starts with 1? Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## 1 or 0 to start path the critical path 4 years 9 months ago #4822

 Steve Sandoval Offline Senior Boarder Posts: 49 Thank you received: 9 Hello James, The specific questions that you get on the exam are random, and people who have taken the exam are ethically bound not to discuss any specific questions. However, that being said, I do have some general advice for you. The important thing is that you know how to calculate critical path, and understand the formula set that you choose to use. So choose the one that makes most sense to you, learn it, understand it, use it, and stick with it. I think that it is unlikely that you will get into a situation where the method matters. The worst case scenario might be that you get a question with a pre-drawn network diagram that uses that other method, and you have to re-draw it. I'm a fan of starting with zero. It simplifies the formulas, and it always made sense to me that you start with zero elapsed time. When you start a stopwatch, it starts at zero time, not at a value of 1. Hopefully this addresses your concern. Regards, Steve Steve Sandoval, PMP Community Moderator Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## 1 or 0 to start path the critical path 4 years 9 months ago #4827

 Craig Arcuri Offline Junior Boarder Posts: 20 Karma: 1 Thank you received: 9 Hello James, I agree with Steve's excellent post and I'm also in agreement with his preference for starting at 0. It just seems more natural to me. I'll add one thing which helped me. Critical path can be defined as: 'The critical path is shortest duration in which the project can be completed'. The project can be completed no sooner than the completion of your critical path activity. The key for me was the word Duration. If your critical path is 9 time units long. If you started at 0 (9 - 0 = 9) or started at 1 (10 - 1 = 9), your duration is still 9. Craig Arcuri, PMP, CSM Community Moderator Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## 1 or 0 to start path the critical path 4 years 9 months ago #4829

 Cornelius Fichtner Offline Administrator President, OSP International LLC Posts: 1536 Karma: 49 Thank you received: 271 I agree with Steve in the sense that the PMP Exam does not have a preference. And based on many discussions I've had with other PMP trainers over the years I have come to the conclusion that you will arrive at the correct answer, no matter if you use "0" or "1" during the exam. However, I disagree with Steve on personal preference. I prefer to start with "1" because that makes more sense to me. If you are a customer of our PMP Exam Formula Study Guide , then please take a look at the section titled "There are two approaches for calculating ES, EF, LS and LF" where we explain this preference in detail. (In a nutshell: First all modern scheduling tools start on day 1, and second when my boss tells me that my project starts on the first day of August, then that is August 1 and not August 0.) So as you can see... using 0/1 is a matter of almost "religious preference" and the good news is that in this particular case the PMP Exam is agnostic. Until Next Time, Cornelius Fichtner, PMP, CSM President, OSP International LLC Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable. Last edit: by Cornelius Fichtner.