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

Date Constraints And Their Impacts

Date constraints are another important topic in planning. Learn about the different constraints you'll see in software like Primavera P6 and how constraints can impact your schedule and your Critical Path.

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Now we're going to cover constraints. What is a constraint? It's an externally imposed restriction affecting or impacting when an activity can start and/or finish. And we use them sometimes to deliberately delay something or to force an activity to start without a delay, you know, we're supposed to be doing that within their float. Constraints may conflict with logical relationship. What if an activity cannot start until a predecessor is finished, and that predecessor won't finish until the 19th? And we said, start that on the 16th.

Well, the 16th before the 19th, it conflicts here, how do these constraints work? I'll explain in a minute. And the emphasis here that I should mention and again repeat that constraints should not be used as an alternative to logic and this is one the examples that I see frequently when I meet with the superintendent and we are going through the project, usually I ask for a list of activities along with its predecessors.

So he would go like, "We're going to install the windows on April 12." And I said why he wants me to put a constraint do it on April 12? And he would say, "That's when the materials will be delivered," or, "That's when the window opening would be framed." I said, "Okay, so let's not put a date of April 12th. Let's say that it has two predecessors installing Windows. Predecessor 1 is having the window opening...

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