Task Decomposition Links

Task Decomposition

Task Decomposition types

A task is modelled in terms of its decomposition into sub-components,
represented by the already-defined process elements. A task specifies
how to achieve a desired state, so when there is enough and
decomposable knowledge of how to perform a task, then this
knowledge can be decomposed into sub-components by the task
decomposition link. Since all the sub-components need to be
“completed” for the task to be performed, the relationship between the
sub-components can be interpreted as a logical “AND”.
The main restriction of the task decomposition link is that the process
element to be reduced (the task to be decomposed) should always be a
task. Therefore a task can be decomposed into lower level process
elements, such as sub-goals, sub-tasks, sub-resources or sub-soft
goals, resulting in four types of Task Decomposition links. The example
shown on the slide specifies that the buy ticket task is achieved if the
user is logged on and the user selects the flight and the credit card
number is available and the web-site is usable.
The task decomposition link is graphically represented in i* as a straight
line marked with an orthogonal dash on the side of the reduced process
element (the task to be decomposed)

Reference: Reference: Neil Maiden (2011) Requirements Engineering Lecture Notes

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