PERT Chart and Subnets
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In Libreplan, there were only projects an orders, one level of work, in TASKPM there are two, master projects and subprojects. Unlike Libreplan, which was focused on the GANNT chart and did not have a PERT chart, TASKPM does have a PERT chart and introduces a top level of planning activity based on it.

The original orders and project code and documentation of Libreplan is preserved but in it project should be understood to be a structured task ordered by a master project.