Satisfiers A requirement specifies a satisfier if the customers con sciously

Satisfiers a requirement specifies a satisfier if the

This preview shows page 139 - 142 out of 182 pages.

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.
Image of page 139

Subscribe to view the full document.

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
Image of page 140
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.
Image of page 141

Subscribe to view the full document.

Image of page 142

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes