Time Management Flashcards

1
Q

Start-Finish Types

A

Finish-to-Start(FS):

An activity must finish before the successor can start. (dig hole; plant tree)(most common)

Start-to-Start (SS): An activity must start before the successor can start.

Finish-to-Finish (FF): An activity must finish before the successor can finish.

Start-to-Finish (SF): An activity must start before the successor can finish. (rarely used)

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2
Q

Lead

A

A lead can be added to start an activity before completion of the predecessor

(Ex: Start writing Training Material before completion of Testing)

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3
Q

Lag

A

A lag is inserted waiting time b/w activities

(Ex: needing to wait 3 days after pouring concrete before constructing the frame of the house)

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4
Q

Triangular Distribution / 3P Estimate

Weighted 3P Estimate / PERT (Program
Evaluation & Review Technique) / Expected
Value (modified BETA distribution)

Standard Deviation (σ)

Variance (v)

A

(P + M + O) / 3

(P + 4M + O) / 6

σ = (P - O) / 6

v = ((P - O) / 6) ^2

Duration/Cost :– * P – Pessimistic; M - Most Likely (Realistic); O – Optimistic

* PERT is probabilistic, using statistical estimates of durations (left)
* Estimate range for an activity = PERT duration +/- standard deviation
* Std deviation tells the amt of uncertainty/risk involved in the estimate for the activity
* There is 68% probability that the work will finish within +/- one std deviation (1 σ)
* There is 95% probability that the work will finish within +/- two std deviations (2 σ)
* There is 99% probability that the work will finish within +/- three std deviations (3 σ)

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5
Q

Total Float / Slack

A

(LS – ES) or (LF - EF)

There is a start formula & a finish formula; Both begin with Late

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6
Q

Activity Duration

A

(EF – ES) or (LF – LS)

Finish - Start for both Early and Late groups

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7
Q

Forward Pass

A

EF = (ES + Duration - 1)

(Add 1 day to Early Start)

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8
Q

Backward Pass

A

LS = (LF - Duration + 1)

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9
Q

Develop Schedule Process – Critical Path Method

A

CPM is deterministic, using specific durations

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10
Q
A
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