It's a tool used in project management. You have a number of activities with dependencies between those activities (ie "Building" can only be complete after "Planning" is finished). Each activity has a duration and once all the dependencies have been set you can calculate various properties such as the critical path, the earliest/latest start/finish for each activity and so on. From the network you can also generate Gantt charts, resource usage and other information needed for project control. It's sometimes also called a Project Network (http://en.wikipedia.org/wiki/Project_network) Farrel On 7/4/05, Florian Gro<florgro / gmail.com> wrote: > Farrel Lifson wrote: > > > = Precedence > > > > Precedence is a library that allows for the creation, manipulation and analysis > > of precedence networks. > > What is a precedence network? > > Thank you. > > >