Quantcast Figure 9-22.PDM network with total and free float calculations.

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Figure 9-22.—PDM network with total and free float calculations. The free and total float times are the amount of scheduled  leeway  allowed  for  a  network  activity,  and are referred to as float or slack. For each activity, it is possible  to  calculate  two  float  values  from  the  results of the forward and backward passes. TOTAL FLOAT.— The accumulative time span in  which  the  completion  of  all  activities  may  occur and not delay the termination date of the project is the total  float.  If  the  amount  of  total  float  is  exceeded  for any activity, the project end date extends to equal the exceeded  amount  of  the  total  float. Calculating  the  total  float  consists  of  subtracting the earliest finish (EF) date from the latest finish (LF) date, that is: FREE  FLOAT.—  The time span in which the completion of an activity may occur and not delay the finish of the projector the start of a successor activity is the free float. If this value is exceeded, it may not affect the project end date but will affect the start of succeeding,  dependent  activities. Figure  9-23.—Independent  activity. 9-22

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