I'm reading Software Engineering book written by Ian Sommerville. On chapter 23 (Project Scheduling), a hypothetical activity chart is given with tasks, their dependencies and duration.

Following the table of the tasks with their dependencies and duration:

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Now from this table an activity bar chart is created:

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Now I'm having difficulty understanding how Task T1 takes 2 week to finish and T2 takes 3 weeks to finish, although their duration is only 10 and 15 days respectively. Can anybody explain what I'm missing here?

  • 5
    These are probably 5-day work-weeks (weekends aren't included). Commented Sep 26, 2018 at 16:26

1 Answer 1


A work week is typically 5 days. Therefore, a 10 day task will take 2 working weeks to finish and a 15 day task will take 3 working weeks to finish.

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