These are then joined together by logic. For example, if Y task cannot begin until after X task, they are linked. The computer processes these links. At the end there are bars which represent the different tasks over time. Lines are shown after each bar where there is projected float.
Bars are red where there is no float - where the item is on the critical path.
As the job goes on the network is updated. It is able to show the change in float and in the critical path. Each cause of delay is considered separately, and added into the project networks whether the delay is caused by the Contractor or Employer. If the impact is over a month or over separate delaying events the computer can produce a series of subnets which show the precise build up over time. One can also combine the impact of both Contractor and Employer delays and observe what the delay is before and after the Employer's delay event.