Disadvantages of critical path analysis...
- Despite providing a network which outlines the time it takes to complete each task, there is no guarantee that each "critical" task will be completed without delay.
- Information used to estimate times in the network may be incorrect, as estimates are likely to be based on past performance and the project could have special requirements which could take longer.
- Changes sometimes take place when projects are carried out. For example, the solicitor used for conveyancing may become ill, and thus a new one may need to be appointed causing the task to become longer. Therefore, these factors should be considered when determining a duration for each task.
- The duration of some tasks could be subjective. For example the duration for Task E - Viewing, could vary considerably for each house. Some houses could sell in the first week, some could take all year to sell.
- Skilled management and committed staff are essential. The network diagram is only useful if SLSL can rely on its staff to adhere to deadlines and ensure that each project is completed as efficiently as possible.
- Certain tasks are outside SLSL's control (Energy performance certificate, finance, conveyancing, surveys etc.), which therefore makes it less likely for the information used to estimate the times of these tasks to be reliable, as external businesses are unlikely to be aware of the network.