Determine Late Start (LS) and Late Finish (LF) of acitivies in PDM network diagram

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Project Management Tutorial: Perform backwards pass to to determine LS and LF of acitivies in PDM network diagram
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[@edwardrodriguez8783]

Excellent video!!!! Just wanted to add. You can always calculate the amount of time you can delay an activity by using the following formula: Late Start - Early Start or Late Finish - Early Finish. So for example on Activity B, LS-ES = 5-5 = 0. This means that here you have 0 float or slack and therefore you cannot delay this activity. Pretty much all activities part of the Critical Path has Zero float. In contrast to Activity C, LS-ES = 7-5 = 2. This means you have a float or slack of 2 and you actually can delay this activity by 2 days and it won't impact your total project duration.

[@Engineer4Free]

Hey thanks for the contribution Edward! Yup you're right all activities on the critical path have zero float/slack. This video is an earlier one in a greater playlist, I get into float/slack in videos 13-15 here: engineer4free.com/project-management =)

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Engineer4Free Is it possible to have negative LS?

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Thank you, these videos have been very helpful. what do I do if the network doesn't close?

[@Engineer4Free]

If you have more than one terminal activity then take the highest EF of all terminal activities as the end date of the project. Bring that value into the LF of all terminal activities, and then proceed with the backwards pass as usual 🤜🤛

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