ABSTRACT
This chapter includes the full text of a report on a usability study that considers the challenges of using smartwatch keyboards while standing and walking, and expands on the concepts presented in Chapter 7. Following the full text of the sample article, the commentary explores its purpose and audience, its structure, the study design, the results, and the conclusions drawn from them. The commentary notes that the results of the usability experiment conducted by Turner and his co-authors meet the requirements of internal validity because the study operationalized the concept that the authors wanted to examine. It does not entirely meet the requirements of external validity because the treadmill test environment and the sample population studied are not sufficiently like the “real world” environment. Finally, the inferences that the authors draw from their results are reliable because of the very low probability of error, but only within the experiment’s constraints (convenience sample of students and walking on a treadmill).
