Civil Engineering Reference
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take place and whether they are correct as far as contents are concerned.
The better the contractor's quality assurance system works, the more the
client's attention can switch from product assessments to process assess-
ments and system assessments.
System assessment
A system assessment focuses on the system with which the contractor checks
and guarantees its quality. This assessment considers whether the planned
assurance measures are carried out. In addition, attention is also focussed
on business operations, which it is true, do not directly result in a product,
but which do create conditions to enable the production process to run well.
Process assessment
A process assessment focuses on the process in which a product is realized.
All of this is described in the working method descriptions drawn up by
the contractor, the so-called implementation schedule and work plans.
Following the work processes on the site, such as ring construction, fitting a
heat-resistant covering, or installing a step barrier, are examples of process
assessments.
Product assessment
A product assessment focuses directly on the finished product. Based on
tests and checks, the client assesses the products on the degree to which
they fulfil set requirements and/or technical specifications. Product assess-
ments provide information with which the quality records made by the con-
tractor can be assessed for their reliability. Measuring the compaction of a
sand bed, verifying a measurement, taking asphalt and concrete samples
and checking a drawing, are all examples of a product assessment.
Fig. 17.7
The cable suspended
U-shaped bridge;
as a result of quality
problems, repairs had
to be carried out
shortly after opening
Experience with external quality assurance - contractor quality
assurance
During the WesterscheldeTunnel project, the client established that the con-
tractor's quality assurance did not always function optimally. Deviations
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