Question

As a developer, I sometimes come across the term ‘Critical Path’ in the context of development execution.
From wikipedia I know it has to do with identifying the necessary tasks that must be completed in a project.

Is my understanding correct?

What is the best definition of Critical Path you have encountered?
How would identify the Critical Path when planning a project?

Answer 1

I’m not sure if it’s the best definition, but it’s certainly one of the most succinct:

The sequence of dependent steps that
determine the minimum time needed to
carry out an operation

another, slightly longer one, and in the context of project management (similar to the Wikipedia article that you linked to):

The path through a series of activities, taking into account
interdependencies, in which the late
completion of activities will have an
impact on the project end date or
delay a key milestone (there may be
more than one critical path)

Your understanding is correct, and the first step to identifying the critical path through a given project, would be to firstly actually define all of the individual steps required to complete the project, then to examine each and every “step” to determine just how dependent/important that step is to both other steps in the project as well as the project overall.

Let’s say I want to paint a wall. The steps might be (this is an intentionally simplified example):

• Buy some paint
• Buy some paint brushes
• Paint the wall

Well, given that the end result would be a nice, freshly painted wall, the first step here (Buy some paint) is absolutely critical to the whole thing. If I can’t achieve that, everything else stops. Also, every step after that is entirely dependent upon step 1 having been completed previously. Therefore, in this (admittedly contrived) example, the first step in the critical path is buying some paint.

Conversely, Step 2 is important for a good paint job but could potentially be omitted if I just throw the paint at the wall!