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Precedence Diagram Method (PDM) is a visual representation technique that depicts the activities involved in a project. It is a tool for scheduling activities using nodes to represent activities and their connections with arrows to illustrate activity dependencies. During project execution, activities in the project may be considered to change and may lead to inconsistency of dependency types. Consequently, dates and deadlines are missed so these mistakes could prove very costly. Since an ontology describes the relationship between the concepts within a domain. Thus, the ontology could be used to represent knowledge of PDM. This paper proposes PDM Ontology in OWL and rules for inferring the new knowledge from existing PDM and validating PDM using SWRL.

Dependency Types Validation of Precedence Diagram Method Using Ontology