Lecture 3C: Development of network diagram + critical path.

Question 1

What is a project schedule

Answer 1

Defined as the sum of all project activities, considering nescessary dependencies and interrelationships.

Question 2

What are the roles of schedules

Answer 2

1. Schedules aid in planning project implementation by logically sequence activities based on time/ressource constraints.
2. Allows to communicate aspects of project progress
3. Schedules serve as the basis for controller implementation of project activities.

Question 3

Categories of schedules

Answer 3

1. Pictorial charts
2. Gantt charts
3. Linear schedules
4. network diagrams.

Question 4

Determining activity durations

Answer 4

D = A / PT
D is duration
P = productivity rate for a crew (units/hour)
T = number of crews
A = units of work to be done

Question 5

How to determine productivity rate and what affects it

Answer 5

• From historical data
  Factors affecting rate:
• Project conditions
• Learning curve
• weather.

Question 6

How to get earliest start and finsih and how to calculate late start and finish

Answer 6

EST and EFT : Forward pass
LST and LFT: Backward pass

Question 7

What is the critical path

Answer 7

Critical path is the longest path duration through the network , and is the minimum overall project time duration.
if any activity in the critical path is delayed, then the entire project is delayed.
There may be more than one critical path.

Question 8

what is the total float of an activity

Answer 8

float = latest finish - earliest finish = latest start - earliest start.

Question 9

What is free float

Answer 9

• Determine the amount of time that an activity can be delayed without delaying the start time of any of its succeeding activities in the project
  = minimum ES of next activity - EF of current activity

Question 10

Interfering float

Answer 10

amount of time that is available to delay an activity without delaying the project esitmated completion time
= total float - free float