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Bar or Gantt Charts

Disadvantages

Difficult to show the interrelationships between activities. The representation of the construction sequence may give too simple

picture.

Networks

Advantages

Shows the interrelationships of activities.

Requires the planner to think logically.

Critical activities are identified.

Non-critical activities are identified, this allows the planner to balance

resources requirements. The effect on future activities of a delay on a previous activities can be easily

analyzed.

Effects of delays can be identified and claims by contractor for extension of

time can be substantiated more easily.

Suitable for complex and difficult projects

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Networks

Disadvantages

Not easily understood by all participants to the contract.

Updating and redrafting can be time consuming and difficult. Requires the planner and users to have an expert knowledge of the

construction processes and methods used in the project.

Line of Balance or Linier Scheduling Method

Advantages

Rate of working is clearly shown.

Information is easily understood.

Provides good pictorial representation of construction sequences.

Effect of delays are clearly shown.

Progress can be recorded easily as an aid to monitoring and control.

Requirement dates for materials can be easily identified.

Different rates of output are evident

Effect of accelerating the activities are clearly shown.

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Line of Balance or Linier Scheduling Method

Disadvantages

Suitable only for repetitive works

May give too simple a picture of the construction process as a lot ofinformation is summarized on the chart.

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15900

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Draw the planned S curve

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ES : Early Start

EF : (ES + Duration)

LS : Late Start (LF Duration)

LF : Late Finish

TF : Total Float (LS-ES)Milestone : Activity with zero duration

SS

FS SF

FF

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A : The amount of work carried out at a given time

B : Time taken to complete a given amount of work

C : Lag time between one activity to another