NOTE    A task may be composed of other tasks (subtasks)

[1] Oxford English Dictionary, .

NOTE    Task in PLCS is the designed action, whereas activities are the actual actions.

[1] PLCS terminology dictionary, 2000.

[1] PLCS terminology dictionary, 2000.

NOTE    Task applicability criteria may be extended or changed when the task is selected for use within a specific support solution.

[1] PLCS Activity Model, 2000.

NOTE    The task execution may diverge from the task procedure (or task method).

[1] PLCS terminology dictionary, 2000.

[1] PLCS Activity Model, 2000.

[1] PLCS Activity Model, 2000.

NOTE    Note: A task may have several identifiers.

[1] PLCS terminology dictionary, 2000.

[1] PLCS Activity Model, 2000.

NOTE    Note 1: One task may have several task methods, leading to several different task specifications.

Examples:

• Change a wheel using a jack
• Change a wheel using a garage lift.

Note 2: The task method normally gives the major procedural steps and is the baseline for the task procedure.

[1] PLCS terminology dictionary, 2000.

NOTE    Note 1: A task may have several names.

Note 2: The task name may provide some level of description of the task.

[1] PLCS terminology dictionary, 2000.

NOTE    Note 1: One task objective may be realized by different task methods, using different resources. These will result in different tasks.

Examples:

• Remove wheel for car on the road
• Remove wheels from car on an assembly line

Note 2: Tasks that accomplish the same objective in different ways should be given different names and identifiers.

[1] PLCS terminology dictionary, 2000.

NOTE    Example: A maintenance plan.

[1] PLCS terminology dictionary, 2000.

NOTE    The same task may be supported by several task procedures, each tailored to the needs of a class of users (eg to accommodate different skill levels).

[1] PLCS terminology dictionary, 2000.

NOTE    Examples include:

• persons performing the task
• task steps completed
• manhours used
• start time
• elapsed time
• spares used
• tools used
• consumables used

[1] PLCS Activity Model, 2000.

NOTE    Human resources are included eg the time taken to perform the task by support staff with specified skill levels.

[1] PLCS Activity Model, 2000.

NOTE    Includes definition of required skills and experience of required support personnel.

[1] PLCS terminology dictionary, 2000.

[1] PLCS terminology dictionary, 2000.

NOTE    Contains tasks with sequencing, dependencies, timing, location and allocation of individual resources.

[1] PLCS terminology dictionary, 2000.

[1] PLCS terminology dictionary, 2000.

NOTE    Note 1: A task specification may include a task objective, a task method (including sequence within the task), task predecessors/successors, pre-/post conditions, required skills/skill levels, required resources, duration and level of effort, applicable constraints, the relationship to the support requirements, etc.

Note 2: The level of detail within a task specification is a business decision.

[1] PLCS terminology dictionary, 2000.

NOTE    A task step has a definite start and a definite finish.

[1] PLCS terminology dictionary, 2000.

[1] PLCS Activity Model, 2000.

[1] PLCS Activity Model, 2000.

[1] PLCS Activity Model, 2000.

NOTE    Note 1: The type of trigger will vary with the type of task:

• Corrective tasks, including diagnostic tasks, are triggered by events (the occurrence of damage, the detection of a failure or a symptom.)
• Preventative tasks, including pre-programmed inspections, are triggered by time, life, usage or other conditions (hours run, number of landings, interval, frequency, if frost is expected).

-Operational and servicing tasks are triggered by actual or intended product use (eg tow out of hangar, re-fuel, de-fuel, configure-for-role) .

Note 2: Triggers may include relative conditions eg 4 months after last inspection.

Note 3: If a usage scenario is adequately defined, and if tasks are linked to resources, the task triggers may be used, in conjunction with product reliability data, to forecast resource requirements and support system performance over a given period.

[1] PLCS terminology dictionary, 2000.

[1] DEXlib definitions, .

NOTE    The test equipment could be part of the PIF.

[1] PLCS terminology dictionary, 2000.

[1] ISO/IEC 12207, Information technology -- Software life cycle processes , 2004.

[1] PLCS terminology dictionary, 2000.

NOTE    See: generic tool and special to type tool.

[1] PLCS terminology dictionary, 2000.

NOTE    Top items have children but no parents.

Synonym to end item.

[1] PLCS terminology dictionary, 2000.

NOTE    Note 1: When considering hardware, traceability may relate to:

• The origin of materials and parts
• The processing history
• The distribution and location of the product after delivery

Note 2: Traceability may be used in the context of a service, for example, in order to track the degree of completion of the service.

Note 3: Cf. definition of traceability in metrology.

[1] ISO 9000, Quality Management System - Fundamentals and vocabulary

NOTE    Note 1: The concept is often expressed by the adjective "traceable".

Note 2: The unbroken chain of comparisons is called a "traceability chain". [VIM]

[1] ISO 9000, Quality Management System - Fundamentals and vocabulary

[1] PLCS Activity Model, 2000.

NOTE    Transaction requests arise from the need to supply resources to support work at a specific support opportunity, or to position resources with a support system.

[1] PLCS Activity Model, 2000.

[1] PLCS terminology dictionary, 2000.

[1] PLCS Activity Model, 2000.