Satisfiers A requirement specifies a satisfier if the customers con sciously

# Satisfiers a requirement specifies a satisfier if the

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Satisfiers: A requirement specifies a satisfier if the customers con- sciously demand the associated property. Satisfiers of the system spec- ify the degree of satisfaction of the customer. An increase in the number of satisfiers usually leads to increased customer satisfaction. Delighters: A requirement specifies a delighter if the stakeholders do not consciously demand the defined system property or the stakehold- ers do not expect the implementation of the property. The customer satisfaction increases exponentially by implementing delighters.

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8.3 Prioritizing Requirements 121 On the basis of requirements classified according to Kano, a prioritization of the requirements can be performed in order to plan the system releases, for example. Prioritization Matrix According to Wiegers Computing requirement priorities The prioritization matrix according to Wiegers [Wiegers 1999] is an ana- lytical prioritization approach for requirements. The core of the approach is a prioritization matrix according to which the priorities of the regarded requirements can be determined systematically. Figure 8-4 shows the structure of a prioritization matrix according to Wiegers as well as the method according to which priorities are calculated. Figure 8-4 Calculation of priorities in a prioritization matrix according to Wiegers Systematic method to determine the requirement priorities In the following, the calculation of priorities in a prioritization matrix according to Wiegers is only briefly sketched. More detailed information can be found in [Wiegers 1999] . The calculation of priorities in a prioritization matrix according to Wiegers can be done as follows: n Determine the relative weights for benefit, detriment, cost, and risk. o Determine the requirements to be prioritized. p Estimate the relative benefit. q Estimate the relative detriment. r Calculate the total values and percentage values for each requirement: Value%(R i ) = Benefit(R i ) × WeightBenefit + Detriment(R i ) × WeightDetriment
122 8 Requirements Management s Estimate the relative cost and calculate the cost percentage for each requirement. t Estimate the relative risks and calculate the risk percentage for each requirement. u Calculate the individual requirement priorities: Priority(R i )= Value%(R i )/(Cost%(R i ) × WeightCost + Risk%(R i ) × WeightRisk) v Assert the rank of the individual requirements. It became apparent in practice that analytical prioritization approaches such as the prioritization matrix according to Wiegers as sketched above demand considerably more time and effort than ad hoc approaches, so these ad hoc approaches are to be favored in many cases. However, analyt- ical approaches have the advantage that the degree of subjectivity in the prioritization results can be significantly reduced so that they lead to more objective and comprehensible results in complex and critical prioritization situations.

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