A Primer on Floats - It is the float that you have under...

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A Primer on Floats From page 248 in your reader: Total Float: TF i = LF i – EFi = LS i – LS i Conceptually, Total float is the maximum amount any single activity can be delayed or extended without delaying the finish date of the project. Free Float: FF i = min ES j – EFi for all j, direct successors of i. Free Float is the maximum amount any single activity can be delayed without delaying the early start date of any subsequent activity. This is also known as “Leading Free Float”. There is also “Lagging Free Float”. Interfering Float: INTF i = TF i - FF i Interfering float is the amount of float that a task has that will cause a delay in the early start date of any directly succeeding task Independent float: INDF j = min ES k – max LF i - D j , for all k direct successors of j, and for all I direct predecessors of j. If INDF<0, set =0 Independent float is the best kind of float.
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Unformatted text preview: It is the float that you have under the worst case scenario. That is, if all preceding tasks finish as late as allowable, and all successive tasks start as early as possible, this is the amount of float you have. Anything on the critical path will have 0 float for any type of float; so there’s no need to perform these calculations for the critical path(s) in your project network. However, you should still be careful since delays in the project may cause the critical path to change. Graphically: Preceding Task Activity Succeeding Task ` Activity Activity Free Float Total Float Ind. Float Int. Float LF Preceding EF Preceding ES Succeeding LS Succeeding Preceding Slack Succeeding Slack Adapted From: “Calculating and using Floats”, Practical PM PTY Ltd. , Available from http://www.mosaicprojects.com.au/PDF/Schedule_Float.pdf ....
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This note was uploaded on 01/06/2012 for the course CIVIL AND 167 taught by Professor Ibbs during the Fall '11 term at Berkeley.

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A Primer on Floats - It is the float that you have under...

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