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ITEC 3230 (10)


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Information Technology
ITEC 3230
Sotirios Liaskos

INTERACTION D ESIGN 1 Evaluation: Introduction W HY , WHAT , WHERE AND W HEN TO E VALUATE  Design and Evaluation happen iteratively one after the other.  Evaluation:  Why: to check that users can use the product and that they like it.  What: a conceptual model, early prototypes of a new system and later, more complete prototypes.  Where: in natural and laboratory settings.  When: throughout design; finished products can be evaluated to collect information to inform new products. 2 B RUCE TOGNAZZINI ON E VALUATION “Iterative design, with its repeating cycle of design and testing, is the only validated methodology in existence that will consistently produce successful results. If you don’t have user-testing as an integral part of your design process you are going to throw buckets of money down the drain” See for topical discussions about design and evaluation. 3 BASIC EVALUATION TECHNIQUES Empirical Usability Study Field Study Analytical Evaluation Inspections Predictive Models Combining approaches Triangulation 4 E MPIRICAL E VALUATION  Empirical Evaluation  Relies on observations from real use/exhibition of the prototype or model.  Two main categories: Usability Study (also: user study, usability testing, user testing) In a controlled lab environment to test usability aspects (e.g. efficiency, effectiveness of interface) Field Study: In the field to test appropriation of the interface (i.e. whether users will use it in their lives. 5 A NALYTICAL E VALUATION  Analytical Evaluation  Does not include observations from the field but arguments based on models (e.g. mathematical) or expert opinion.  Main categories: Inspections: Heuristic Evaluation, Walkthroughs (Cognitive Walkthroughs, Pluralistic Walkthroughs) Predictive Models: 6 GOMS, KLM, Fitt’s Law E VALUATION P URPOSES  Formative Evaluation:  Evaluation that takes place during design to check whether it continues to meet the users’ needs (while more design is happening).  Summative Evaluation:  Evaluation that takes place in the end of the
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