Tasks in Model Tasks@0.0.4

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The tasks catalog defines abstract task classes each of which characterizes human activities that are intended to change the state of system entities, environmental entities or even the state of personnell or third parties. The task definitions in this catalog are abstract task classes, also referred to as task types. This means that these definitions are independent of the actual entities the task is performed with. The state change that is associated with a task class is, thus, also to be described in an abstract way, independent of the actual entities. However, it is still possible to restrict a task class to entity classes that is that certain classes of tasks can only be performed with or are only specified for certain types of entities. The task definitions (TaskType elements) within the catalog are associated to an inheritance semantics that is expressed by use of the tree containment structure. The tree structure implies that subordinate task definitions are specializations of their respective superordinate task definitions. Subordinate definitions, thus, inherit all properties, activities, task characeristics, duties, relations, needed tools, etc. However, the specialization also implies an alteration to these features by the subordinate definition in any of these regards. Task description categories on the other hand are simple collections of task definitions without further semantics. Currently, this catalog only provides a basic collection of task definitions that might not match tasks with similar terms used, but dissenting defiitions and structures, that are common to the industry. Also the categorization may be subject to future improvements, as there may be multiple categorization criteria applied that are not clearly expressed. The main idea in mind when identifying task types was a plant's lifecycle and the respective activities for every phase.

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