Information Technology Reference
In-Depth Information
Closure of Tollgate 2: Approval of the gate keeper is obtained.
Defined system technical and operational requirements.
Translate customer requirements (CTSs or Big Ys) to software/process
functional requirements: Customer requirements CTSs give us ideas about
what will make the customer satisfied, but they usually cannot be used di-
rectly as the requirements for product or process design. We need to translate
customer requirements to software and process functional requirements. An-
other phase of QFD can be used to develop this transformation. The axiomatic
design principle also will be very helpful for this step.
A software conceptual design (functional requirements, design parameters,
flowcharts, etc.).
Tradeoff of alternate conceptual designs with the following steps:
Generate design alternatives: After determining the functional requirements
for the new design entity (software), we need to conceptualize (develop)
products, which can deliver those functional requirements. In general, there
are two possibilities. The first is that the existing technology or known
design concept can deliver all the requirements satisfactorily, and then
this step becomes almost a trivial exercise. The second possibility is that
the existing technology or known design cannot deliver all requirements
satisfactorily, and then a new design concept has to be developed. This
new design should be “creative” or “incremental,” reflecting the degree of
deviation from the baseline design, if any. The axiomatic design (Chap-
ter 13) will be helpful to generate many innovative design concepts in
this step.
Evaluate design alternatives: Several design alternatives might be generated
in the last step. We need to evaluate them and make a final determination
of which concept will be used. Many methods can be used in design evalu-
ation, which include the Pugh concept selection technique, design reviews,
and failure mode and effects analysis (FMEA). After design evaluation,
a winning concept will be selected. During the evaluation, many weak-
nesses of the initial set of design concepts will be exposed, and the concepts
will be revised and improved. If we are designing a process, then process
management techniques also will be used as an evaluation tool.
Functional, performance, and operating requirements allocated to software
design components (subprocesses).
Develop cost estimate (Tollgate 2 through Tollgate 5).
Target product/software unit production cost assessment.
Market:
Profitability and growth rate.
Supply chain assessment.
Time-to-market assessment.
Share assessment.
Overall risk assessment.
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