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Slack of an Event in a network is the difference between the latest event time and the earliest event time at its terminal point or node. Check FAQs
S=TF0-FF0
S - Slack of an Event?TF0 - Total Float?FF0 - Free Float?

Slack of Event in CPM Example

With values
With units
Only example

Here is how the Slack of Event in CPM equation looks like with Values.

Here is how the Slack of Event in CPM equation looks like with Units.

Here is how the Slack of Event in CPM equation looks like.

6Edit=24Edit-18Edit
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Slack of Event in CPM Solution

Follow our step by step solution on how to calculate Slack of Event in CPM?

FIRST Step Consider the formula
S=TF0-FF0
Next Step Substitute values of Variables
∴ S=24d-18d
Next Step Convert Units
∴ S=2.1E+6s-1.6E+6s
Next Step Prepare to Evaluate
∴ S=2.1E+6-1.6E+6
Next Step Evaluate
∴S=518400s
LAST Step Convert to Output's Unit
∴S=6d

Slack of Event in CPM Formula Elements

Variables
Slack of an Event
Slack of an Event in a network is the difference between the latest event time and the earliest event time at its terminal point or node.
Symbol: S
Measurement: TimeUnit: d
Note: Value should be greater than 0.
Formulas to find Slack of an EventOpen Variable
Total Float
Total float is the period by which an activity can shift its timing without affecting the relevant schedule completion date.
Symbol: TF0
Measurement: TimeUnit: d
Note: Value can be positive or negative.
Formulas to find Total FloatOpen Variable
Free Float
Free Float is the period by which an activity can shift in its timing without affecting the early start of any succeeding activity or event.
Symbol: FF0
Measurement: TimeUnit: d
Note: Value should be greater than 0.
Formulas to find Free FloatOpen Variable

Other Formulas to find Slack of an Event

​Go Slack of Event given Independent Float
S=FF0-IF0

Other formulas in Critical Path Method category

​Go Total Float in CPM
TF0=LFT-EFT
​Go Free Float used in CPM
FF0=TF0-S
​Go Independent Float used in CPM
IF0=FF0-S
​Go Interfering Float
IF=TF0-FF0

How to Evaluate Slack of Event in CPM?

Slack of Event in CPM evaluator uses Slack of an Event = Total Float-Free Float to evaluate the Slack of an Event, The Slack of Event in CPM formula is defined as the time an event/task can be delayed without delaying the project's completion. Slack of an Event is denoted by S symbol.

How to evaluate Slack of Event in CPM using this online evaluator? To use this online evaluator for Slack of Event in CPM, enter Total Float (TF0) & Free Float (FF0) and hit the calculate button.

FAQs on Slack of Event in CPM

What is the formula to find Slack of Event in CPM?
The formula of Slack of Event in CPM is expressed as Slack of an Event = Total Float-Free Float. Here is an example- 6.9E-5 = 2073600-1555200.
How to calculate Slack of Event in CPM?
With Total Float (TF0) & Free Float (FF0) we can find Slack of Event in CPM using the formula - Slack of an Event = Total Float-Free Float.
What are the other ways to Calculate Slack of an Event?
Here are the different ways to Calculate Slack of an Event-
  • Slack of an Event=Free Float-Independent FloatOpenImg
Can the Slack of Event in CPM be negative?
No, the Slack of Event in CPM, measured in Time cannot be negative.
Which unit is used to measure Slack of Event in CPM?
Slack of Event in CPM is usually measured using the Day[d] for Time. Second[d], Millisecond[d], Microsecond[d] are the few other units in which Slack of Event in CPM can be measured.
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