It is a method for selecting design options QOC stands for
Decompose your problem into important interaction problems. Reformulate each interaction problem so that it forms a question (How can … ?) Step 1: Questions for example: How can the interface of our online community allow users to gain status?
Formulate the options that you found or create new options for the questions that you formulated. Step 2: Options for example: (question was: How can the interface of our online community allow users to gain status? ) -Other users could vote for contributions -This will happen implicitly, we do not need to provide the option -One user will be put ‘in the spotlight’ on the front page
Decide on criteria, on which you would like to judge the options. Designing Criteria Is difficult Objective (at least it should be possible to agree on the application of a criterion) Specific (makes scoring easier) Selective (if all options score the same the criterion is not so useful) Non-overlapping (if options score the same on multiple criteria you need less. Classic usability criteria are: learnability, efficiency, effectiveness, user satisfaction. Not all criteria need to be of the same weight, you can use weights in deciding for ideas. Classic sociability criteria are: Trust and Security, Governance, Accessibility, Effective Communication Step 3: Criteria
See next slide: Each group member gives each option a score for each criterion. Scores can be: +1 (fits), 0 or -1 (doesn’t fit) Scores for all criteria are added. Criteria can be weighted if needed Step 4: Rating
If a criterion doesn’t differentiate, consider revising If scores are controversial (wide raging consider revising) Some ‘noise’ is expected on scores. If ‘winner’ has 45 and runner up 30 there is a true winner If ‘winner’ has 45 and runner up 41 the outcome is undecided (even replacing one group member would lead to a different score) Step 5: Interpretation
There is a clear rationale for selecting the idea. You are more certain your included all information in your decision process Decision taking can be traced back later on in the process ‘Emotional’ arguments and ‘gut’ feeling are not well represented in QOC, but they are nevertheless important QOC Analysis Conclusions
Questions, Options, and Criteria: Elementsof Design Space Analysis Allan MacLean, Richard M. Young, Victoria M., E. Bellotti, Thomas P. Moran HUMAN-COMPUTER INTERACTION, 1991, Volume 6, pp. 201-250. Copyright O 1991, Lawrence Erlbaum Associates, Inc. Online Version This presentation is (loosely) based on