Construction Project Management
Planning & Scheduling
Bar Charts
Building a CPM Schedule
Networks & Logic
CPM Scheduling
Logic Relationships & Precedence Networks
Progress Updating

Non-Work Days and Calendars

Continuing our discussion of Calendars, let's discuss non-work days and how they can impact your schedule's timeline.

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Now we wanna make sure, in the calendar, we allocate some non-work days for days that we will not have work in them. And we will not have work because either something we expect, or something we expect and we know when it's gonna happen, or it's something we expect but we don't know when it's gonna happen. And that's why I talk about non-work days as two types.

One, scheduled, such as holidays and shut-downs, we know that we're going to shut down, you know, between such and such. Some countries have very severe weather and they may shut down during that, or religious holidays or national holiday. And we have other type of non-work days. They are unscheduled, and those, usually, we don't know how many but we estimate them based on previous history, such as severe weather day and other unforeseen conditions.

In fact, it is wise always to have those contingency days because, according to Murphy's Law, anything that may go wrong will go wrong. So if you assign those non-work days, where do you put them, at the start of the schedule, at the end of the schedule, or distributed throughout the schedule? The problem, if you put them at the start, it skews your schedule and shows you way ahead of schedule when you are not. And the opposite happens when you put them at the end of the schedule, that you don't give yourself any break in the beginning and you seem to l...

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