What technique allows for a systematic evaluation of user experience best practices?

Heuristic evaluation is a usability inspection method intended for discovering usability issues in a user interface through expert analysis. This technique systematically assesses the design by employing established usability principles, known as heuristics, which serve as guidelines to identify potential problems that users may encounter.

Experts review the interface and evaluate it based on criteria like consistency, error prevention, and user control, among others. This allows for a thorough examination of the user experience, highlighting areas which may require improvement based on best practices in UX design.

The other techniques listed serve different purposes in the UX process. For instance, the K-J Method focuses on organizing ideas and data typically during brainstorming sessions, while affinity diagrams help in categorizing information post-research to find patterns. Customer journey maps illustrate the user's experience over time across various touchpoints, but they do not provide a systematic evaluation of best practices in the same way heuristic evaluation does.