Understand Lead And Lag In Project Execution
In my previous article ,I have talked about sone of the factors that must be considered when it cones to work breakdown structure for project. In this article, I want to look at some of the facts that you need to know about use of leads and lag in project execution. Follow me as we will look at that together in this article.
A lead is a change in a logical relationship that allows the successor activity to start before the predecessor activity ends in a Finish to start relationship.
A lead is implemented when you need to accelerate a successor activity in order to shorten the overall project schedule.
Leads will vary in length, depending on the acceleration required by the amended schedule, . Sometimes, a lead introduces a risk of rework because the successor activity starts before the completion of the predecessor activity, and the complete, comprehensive inputs may not be available.
The programmer for a website may decide to start programming the home page four days before the interface design is approved. Starting the programming may shorten the overall project schedule by four days. However, if the design is not approved, there may be significant rework for the programmer , resulting in the loss of some or all of the four-day gain.
A lag is a delay In the start of a successor activity. Some relationships requires a lag before the subsequent activity can begin. Lags are determined by an external or mandatory dependency and may affect activities with any of the four precedence relationships.
When a lag is introduced in an FS relationship, the overall elapsed time required for the chain of activities increases. The start and finish dates of the successor activity are delayed when there is a lag.
There are several reasons why lag occurs . Example of two possible lag are:
- The permit application takes six weeks to process.
- The adhesive must dry until tricky before the laminate can be installed.
In the first example, the activity that follows the submission of the permit application is delayed by six weeks due to an external dependency of the application processing time.
In the second example, the installation of the laminate activity is delayed by the amount of time the adhesive takes to dry. This is a lag due to a mandatory dependency because the delay is inherent to the work itself.
Now your take on this article…
I know you might agree with some of the points that I have raised in this article. You might not agree with some of the issues raised. Let me know your views about the topic discussed. We will appreciate it if you can drop your comment. Thanks in anticipation.
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