Civil Engineering Reference
In-Depth Information
to discover faults in the system could only occur at a very late stage -
approximately one month prior to putting the tunnel into operation - which
then lead to a problematic course of the testing trajectory.
In order to limit the risks in future calls for tenders, it would have to be deter-
mined prior to the granting the assignment, that the potential supplier not
only understands what he is being asked, but also that he has sufficient know-
ledge and experience available to manage a proper finalization of such
projects. Furthermore, the client must recognise that such knowledge and
experience and the associated efforts - such as the building of a test bed - will
have repercussions for the project planning and the build up of costs. In the
WesterscheldeTunnel project it appeared that the planned amount of time and
money for the managed and proper course of the testing trajectory, were tight.
Due to the fact that in practice it does not happen that a faultless system is
delivered, it is common to record the acceptance criteria beforehand in the
form of types of faults and the maximum amounts thereof. In the contract
and schedule of requirements, no attention was paid to this and the con-
tractor did not dare to take the (entrepreneurial) risk to record this anyway
prior to the commencement of the testing.Yet it is better to do this, because
the recording of clear acceptance criteria of a system beforehand, prevents
many discussions.
Fig. 15.15
Testing
Verifics successfully applied
The recording of the requirements in Verifics aided with the PKM model,
appeared to be a most successful intervention which made the managing of
the scope of the testing trajectory possible. It was only possible to define the
necessary tests and testing set-ups through the clear insight into the
requirements. In the process that lead to the dividing up of the tests into
phases and to the contextual definition of the various tests, it appeared that
the designing of systems is a skill, but likewise that the designing of tests is
equally an expertise.
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