Rapid Iterative Testing and Evaluation (RITE) is a formative usability method focused on quickly identifying and fixing usability problems. The core principle is to make immediate changes to the design as soon as a problem is identified with a test participant. This modified design is then tested with subsequent participants to verify that the fix was effective. This "find, fix, and verify" cycle happens rapidly within the overall testing period, distinguishing it from traditional usability testing where fixes are implemented after the entire study is complete.

A. This describes a testing schedule or cadence, not the specific methodology of how the testing itself is conducted.

B. While RITE can be informal, its defining characteristic is the rapid fix-and-retest cycle, not just informality or user access.

D. RITE is fundamentally a qualitative method, focused on observing user behavior to find and resolve design flaws, not on collecting quantitative metrics.

1. Medlock, M. C., Wixon, D., Terrano, M., Romero, R., & Fulton, B. (2002). Using the RITE method to improve products: A definition and a case study. Usability Professionals Association (UPA) 2002 Conference Proceedings. In Section "The RITE Method Defined," the authors state, "The key to this method is the decision to fix problems as soon as they are identified and to verify the effectiveness of the fix with the very next participant."

2. Sauro, J., & Lewis, J. R. (2016). Quantifying the User Experience: Practical Statistics for User Research (2nd ed.). Morgan Kaufmann. In Chapter 1, Section "Formative Evaluation," the RITE method is described as one where "problems are fixed as soon as they are identified and verified with the next participant(s)."

3. Rubin, J., & Chisnell, D. (2008). Handbook of Usability Testing: How to Plan, Design, and Conduct Effective Tests (2nd ed.). Wiley. Chapter 2 discusses iterative testing, explaining that "the team makes changes to the user interface... and then tests the revised version with more participants," which is the foundational concept of RITE.