e.g., in a project, some paths have six days of float. It’s up to the project manager if she wants to use it or not. You can see it is like necessity or dependency.īut the float is the flexibility we have that helps make the desired choices in a schedule. In this case, you need to delay the wallpaper work by a few days. Like you cannot start putting wallpaper until the final coat of paint gets done and dried. We use Lag to put delay deliberately to meet already available dependency or pre-requisite. Then what is the difference between lag and total float?īoth have a different purpose when we look at it from a realistic project management scenario: Total Float is the amount of time by which you can delay an activity from its early start date without delaying the project finish date. Lag is a delay in the successor activity. I see another confusion here – is Float the same as lag? The reason for this confusion lies in the concept of the ability to delay an activity. The difference between the two durations will give you the float for each activity in the second sequence. Subtract its total duration from the duration of the critical path sequence. We will discuss negative float later in this post.įind the second-longest sequence of activities in the network diagram. Here you can see, a Float can be a positive or negative number. You see that your calculated critical path activities on the schedule network diagram will take 22 days. In other words, suppose you have a project to finish in 25 days. The Total Float is the difference between the project completion date and the total duration of critical path activities. The Total Float and slack are synonymous. Let’s make it simple further to see – How is float time calculated in critical path analysis? And what is total float in the critical path method? Is total float a slack? LS (Late Start) – ES (Early Start) or LF (Late Finish) – EF (Early Finish) How is total float calculated?Ī simple formula to calculate total float or slack is our usual formula i.e. So, this float talks about the flexibility one path has compared to others. A network diagram can have many paths to reach the end. So, the Total Float talks about available flexibility at the project level. That a schedule activity can be delayed or extended from its early start date without delaying the project finish date or violating a schedule constraint. Let’s see what these floats are all about Based on PMBOK® Guide Sixth Edition Total Float is There are 2 types of floats that exist in a PDM i.e. All activities on the critical path known as critical path activities. This longest path determines the shortest possible project duration. It is the sequence of activities to represent the longest path through a project. In a PDM, a critical path is a tool to determine minimum project duration. Here, I am not going into the details of creating a network diagram using these relationships. PDM has four types of precedence relationships to complete the network diagram – ES, EF, and LS & LF. So, we assign precedence relationships based on the dependencies between each activity. One or more logical (or precedence) relationships link these nodes graphically to show the sequence we perform these activities. In this model, nodes represent activities. PDM is one of the Schedule Network Diagrams or schedule models. Successor – A dependent activity that logically comes after another activity on a schedule.Predecessor – An activity that logically comes before a dependent activity in a schedule.
Here, activity can be either predecessor or successor corresponding to a dependent activity we refer to – These dependencies reflect the order in which we schedule project activities. So, this diagram shows dependencies among those project activities. It is a graphical representation of logical relationships among project activities. Let’s discuss first a few points/definitions of Schedule Network Diagram, PDM & Critical Path 1.
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In this blog, I am addressing the confusion of Float and Free Float raised by PMP aspirants. Many PMP® exam aspirants consider total float and free float the same. This flexibility can be at the project level or the activity level gives different choices.ĭuring PMP® coaching sessions, I observe a lot of confusion around Float and Free Float that exists in a schedule network diagram. The term Float expresses flexibility that helps in such schedule adjustments. Float and Free Float is one of the sources to make such adjustments. Project managers usually apply schedule adjustments to develop an efficient CPM schedule.
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