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(so holding on the activity D for the time being and going to path2 activities) Activity EĮS of activity E is 1 as is the first activity in this path after the start. So for this we need to calculate ES and EF of activities in path2. So the ES of D = Maximum of EF of activities C and F +1. So to calculate early start of D, you need first calculate the early finish of both C and F and then take the latest (maximum) early finish among both C and F. For activity D, there are two predecessors. So in this case for activity C, ES = 11+1 = 12 and EF = 12+2-1 = 13 Activity D So in this case for activity B, ES = 5+1 = 6 and EF = 6+6-1 = 12 Activity CĮS of activity C is calculated by adding 1 to the early finish of the predecessor activity. Activity BĮS of activity B is calculated by adding 1 to the early finish of the predecessor activity. Let us now do the same for all the activities in path 1. So early finish is calculated as follows. This indicates that the first activity starts on day 1.Įarly finish of the activity node is how early the activity can be finished considering the early start and duration. The early start of activity A is always “1” as this is start activity node. In path1, the first activity node after the start activity node is activity A. Let us take path 1 first as this is the critical (longest) path in the project. Forward pass simply means traversing through each activity node from left to right to find out early start and early finish. We will use a technique called forward pass to find out early start and early finish. Finding out Early Start and Early Finish Using Forward Pass So as we learned critical path is the longest path in the project, path1 is the critical path. Path 1 : START=> A => B => C => D => Finish
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Example of Network Diagramįor the purpose of this blog post we will take the below example of project schedule network diagram to find out float, total float, free float using the early start, early finish, late start and late finish.įiguring out the critical path in the projectįor that, first we list down the paths available in the project.
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Meaning that, if the float is high, then this will give the project manager room to play and use more resources towards the critical path activities.Ĭalculating Early start, late start, early finish and late finish helps the project manager to know, how early or late the activity can be started or finished.Īlso in this blog post we will look at few important concepts such as how to calculate total float and free float. In that case the project manager has lot of flexibility to play with the activities which are not on the critical path. In your project compared to critical path, other paths or very shorter.