Cost-Justifying Usability, 2nd Edition

7. If there is a need to prioritize the use of methods within a limited budget,

or to justify the use of a specific method then you should:

a. Decide how each method will contribute to the overall benefits identified

in step 4. (Group into one composite method any component methods

that are used together, such as a usability test followed by an interview

and a questionnaire.)

b. Because later methods typically depend on the results of methods carried

out earlier (e.g., scenarios depend on the context of use), the overall cost

benefits cannot be partitioned between the individual methods. Instead

the potential value of a particular method can be assessed ...