Bar Charts Disadvantages
Introduction
It is important to note that supply chain management is a recognised function of successful business management the world over and that the construction industry is no exception. It can therefore, not be over emphasised that if our business is to enjoy future success, more effort will have to be made at improving supply chain management.
“Supply chain management is the management and co-ordination of the whole supply chain from the supply of raw materials through their procurement, transport, manufacturing, assembly, delivery to site and installation to completion, commissioning and handing over to the customer on time, within budget and to quality that is expected.”
This paper is aimed at giving best practice advice, for our
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Bar charts do not require computers or special software as they can be drawn easily by hand.
The types of activities are not limited, since the bar chart is simply a diagrammatic representation of the time characteristics of an activity.
There is no logical restriction to the number of activities that are shown against an activity.
Disadvantages of bar charts
Bar charts do not model the inter-relationship between activities, and does not model the consequences on expected completion if the actual duration is not met.
Bar charts are limited to monitoring progress rather than forward planning of the project due to the absence of logic links between activities.
Bar charts do not show sufficient detail. This presents a risk of schedule slippages, time overruns, improper decisions and contract complications. This is a major disadvantage especially for large and complex projects.
Bar charts do not show the logical sequence of operations.
Uses of Bar charts
Can be used to plan time scale for a
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Key uncertainties often exist when estimating the duration for activities, therefore can be a poor prediction for elapsed time. Overly optimistic durations can result in the project not being completed on time, whereas pessimistic durations can result in under – usage of resources.
Complexity of the diagram will increase as more activities are included.
The use of Network models
Models can be used to calculate the estimated time to complete the project.
They are a good visual communication and planning tool for effective time management.
They also enable more effective resource planning; resources can be diverted away from ‘non-critical’ to ‘critical activities’ e.g. staff could be moved from one task to another, should problems of overrunning occur on critical activities.
They help in highlighting critical activities which must be completed within their planned time, otherwise the elapsed time of the project will not be
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