Evaluate The fifth stage involves evaluation of what has been built. Design work can only ever represent a best guess at what kind of solution will achieve some research and design goals. This is the stage at which that best guess is tested. Here, existing HCI methodologies can be used. There are many techniques to draw on: from focus groups to laboratory evaluations to in situ field tests of technologies and so on. Guidance as to what kind of evaluation technique is appropriate comes, in part, from the design or research goal, of course. When values become part of the research agenda, though, what counts as pertinent and relevant to evaluation is also altered and broadened. If the values are related to, say, digital footprints, then evaluation might concern itself with whether a chosen design delivers useful resources for, let us say, government monitoring or, by way of contrast, for an individual amassing personal data. What counts as good and bad, as worthwhile or invasive, will vary accordingly