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# TOPIC: QuestionActivity Duration Equation clarification

## Activity Duration Equation clarification 6 years 8 months ago #2147

 Saad Al Naib Topic Author Offline Fresh Boarder Posts: 6 Thank you received: 0 Hi , Equations of Network Diagram in specific: - Activity Duration = EF-ES+1 - Activity Duration = LF-LS+1 - ES = EF of predecessor +1 - LF = LS of successor -1 Ex. Page 90 of PMP Certification Mathematics by Vidya And Riva 9 2 11 15 1 16 D F 19 10 21 21 6 22 ES Dur. EF Task name LS Slack LF Why other books like Headfirst explains such concept while others above cannot see it applying. Am I missing something am talking about +1, -1 in the equations above just want to understand this but it seems different diagrams some support such other not why ? Thank You. saad 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.
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