Extension to Open Design quality incorporated in the mathematical model

Let us extend this quality classification to the methodology of Open Design. To this end we define:

• Relevant quality = quality as relevant to all stakeholders;

• Specified quality = quality as specified in the bill of materials and legislation;

• Realised quality = quality incorporated in the LP model.

In the first version of the LP model only a small part of the relevant and specified quality is incorporated (Fig. 6.3). In the second version some more service quality and specified quality can be accounted for. In the third and later versions still more stakeholder constraints and more rules or specifications are incorporated.

In each new version of the LP model we can vary the values of the constraints. These variations constitute iterations of the LP model.

In the example of the professor's time allocation problem of Section 3.1, the first version of the LP model is limited to two variables x1 and x2, teaching time and research time. Iterations may pertain to the constraint of his family commitment, for instance 30, 40, or 50 working hours per week.

In a second version of the LP model, the professor may split his teaching time into two parts - time for lecturing and time for individual coaching of

Non-realised crucial

Non-realised crucial

Figure 6.3 In each new version of the LP model mode quality aspects are covered

students - and set constraints for each of them. Within that second version of the model he then can vary the constraints in different iterations.

To summarise, in Open Design we see different versions of the LP model being made to accommodate the interests of emerging shareholders. Within these versions, iterations are made with different values for constraints in order to achieve a positive solution space.

Nevertheless, it may be that a positive solution space cannot be reached. The designer of the LP model should then look for an opportunity to exchange some cosmetic quality for some extra service quality by asking for exemptions from specifications or rules that are not relevant in the case at hand but a hindrance to getting a positive solution space.

This implies that in Open Design the bill of requirements and building legislation are not considered to be completely fixed. There should be room for exceptions that are reasonable in the light of the specific circumstances. Of course, the effort of obtaining approval from the authority concerned must be justified by the impact on the solution space.

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