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Subject: RE: [plcs-dex] Assignment of Time properties - to task or person?
Tim I’d say that you shall
use a third alternative : -
Required_resource, and assign a property to Required resource representing
planned required time -
Resource_as_realized and assign a property to Resource_as_realized
representing actual time Then you can use a
consistent approach regardless of whether you use a Person, Type_of_person,
Oragnization or Organization_type as the
Resource Regards Leif From:
Tim Turner [mailto:tjt@lsc.co.uk] The
time required to perform a task, by 1 (mechanic) person is 4 hours.
Looking
at the model, I see that it is possible for me to represent this in one of two
ways; 1.
By modelling the duration as an assigned_property of the (resource)
type_of_person_definition - i.e. 1 mechanic required for 4 hours or, 2.
By again modelling the duration as an assigned_property, but this time
associated with the task_method_version_assignment instance. The
fundamental question is whether the time required (duration) should be a
function of the task, or as a function of the person. Note:
this task may be assigned to more than one item through the
task_method_version_assignment. However, the time required is for each task,
thus option 2 forces each item to have it's own task_method_version_assignment
and a repetition of the duration property for each. The alternative, option 1,
assigning the duration to the resource_property would appear to make more
sense, since the duration may change if the skill level of the person assigned
changed. Is
this in agreement with other modeller views? Kind
regards, NB.
Option 2 might be used where the effort is defined in terms of each item that
the task is defined/used with. E.g. if for item a) the task takes 4 hours, but
for item b) the time is 5 hours. Option
1 appears best used if the time is the same for all items that the task is
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