: Determining if a new product version is actually "better" than the previous one or the competition.
: The authors champion the use of Standardized Usability Questionnaires (like the SUS) to create a consistent "yardstick" for user experience across different products and competitors. Practical Applications in the Story Quantifying the User Experience. Practical Stat...
: Measuring exactly how long it takes a user to complete a purchase and if that time is within acceptable business limits. : Determining if a new product version is
: One of the most famous parts of the book's narrative is its deep dive into sample sizes. It reconciles the "magic number five" for finding usability problems with the larger samples needed for statistical significance in summative studies. : One of the most famous parts of
The book provides a toolkit for the daily "conflicts" a researcher faces:
: Deciding which of two designs is statistically superior.