Automotive Quality Systems Handbook, 2nd Edition

The work processes sit along a chain in the related business process and each has

measurable outputs. However, not all work processes are triggered by other work

processes. Sometimes a work process is triggered by a condition, a date, or a particular

type of demand. The work processes in the chain shown in Figure 4.1 are not always

the same processes, it depends on what triggers the input. Now, analyze each work

process and identify the activities that produce these outputs. Decomposing the layers

further, by analyzing each activity, will identify the tasks performed by specific individuals.

The tasks may be illustrated in a flow chart to show the sequence and interaction. This

is as deep in the hierarchy that you should need to go because when you have identified

a task performed by an individual, the methods can be described in procedures or guides.

The decomposition can therefore be illustrated as in Figure 4.3.

The top-down approach is explained in more detail in an e-book, A Guide to Process

Management.

2

Bottom-up approach

Take any group of tasks within a function and establish their relationships. Identify which

task feeds another with inputs. Bring in other groups when it is realized that there is a gap

in the chain. Extend the chain until you reach the tasks that interface with the external party

122 Quality management system

Organization

(system)

Business process

Work process

Activity

Task

Mission management

Resource management

Demand creation

Demand fulfillment

Plan

production

Produce product

Deliver product

Support product

Set-up machine

Make parts

Assemble parts

Test parts

Operation 1

Operation 2

Operation 3

Figure 4.3 System decomposition

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