1. Lowest Total Float – The activities with the lowest total float (sometimes abbreviated as “TF”) values
may be considered critical path activities. This calculated value may be a positive number, zero, or
even a negative number.
2. Negative Total Float – Using this classification method, any activity that has negative float is
considered critical, even if other activities have a lower negative float value. Under this classification,
if an activity is contributing to late project completion then it is worthy of inclusion on the critical path
list regardless of its direct contribution to delayed project completion. Another way of framing thisconcept is to say that any work is understood to be critical if it scheduled to be completed after the
date required for a timely project completion.
3. Longest Path – The concept and term, “longest path” has existed since the beginning of formal CPM
theory. Commercial implementation of this process into a defined algorithm has only recently been
made and is recommended for projects that use multiple calendars and activity constraints.
The longest path calculation begins by identifying the activities that have an early finish equal to the
latest calculated early finish for the project and then identifies all driving relationships for these
activities and traces them back to the project start date. This special calculation scheme is currently
only instituted in Primavera scheduling software products. When discussing the theory of longest
path, we will use the phrase using lower-case letters. When describing the Primavera software
feature called, “Longest Path,” we will use upper-case to distinguish the implementation from the
theory.
4. Longest Path Value Method - The principle of longest path value differs from the approach used by
Primavera in that, instead of just noting activity inclusion or exclusion from the longest path, a
numerical value is calculated for each activity that describes the degree of longest path much like
float describes the degree of criticality.
may be considered critical path activities. This calculated value may be a positive number, zero, or
even a negative number.
2. Negative Total Float – Using this classification method, any activity that has negative float is
considered critical, even if other activities have a lower negative float value. Under this classification,
if an activity is contributing to late project completion then it is worthy of inclusion on the critical path
list regardless of its direct contribution to delayed project completion. Another way of framing thisconcept is to say that any work is understood to be critical if it scheduled to be completed after the
date required for a timely project completion.
3. Longest Path – The concept and term, “longest path” has existed since the beginning of formal CPM
theory. Commercial implementation of this process into a defined algorithm has only recently been
made and is recommended for projects that use multiple calendars and activity constraints.
The longest path calculation begins by identifying the activities that have an early finish equal to the
latest calculated early finish for the project and then identifies all driving relationships for these
activities and traces them back to the project start date. This special calculation scheme is currently
only instituted in Primavera scheduling software products. When discussing the theory of longest
path, we will use the phrase using lower-case letters. When describing the Primavera software
feature called, “Longest Path,” we will use upper-case to distinguish the implementation from the
theory.
4. Longest Path Value Method - The principle of longest path value differs from the approach used by
Primavera in that, instead of just noting activity inclusion or exclusion from the longest path, a
numerical value is calculated for each activity that describes the degree of longest path much like
float describes the degree of criticality.
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