  Measure user experience in MR (i.e., AR/VR) user studies is essential.
Researchers apply a wide range of measuring methods using objective (e.g.,
biosignals, time logging), behavioral (e.g., gaze direction, movement
amplitude), and subjective (e.g., standardized questionnaires) metrics. Many of
these measurement instruments were adapted from use-cases outside of MR but
have not been validated for usage in MR experiments. However, researchers are
faced with various challenges and design alternatives when measuring immersive
experiences. These challenges become even more diverse when running out-of-the
lab studies. Measurement methods of VR experience recently received much
attention. For example, research has started embedding questionnaires in the VE
for various applications, allowing users to stay closer to the ongoing
experience while filling out the survey. However, there is a diversity in the
interaction methods and practices on how the assessment procedure is conducted.
This diversity in methods underlines a missing shared agreement of standardized
measurement tools for VR experiences. AR research strongly orients on the
research methods from VR, e.g., using the same type of subjective
questionnaires. However, some crucial technical differences require careful
considerations during the evaluation. This workshop at CHI 2021 provides a
foundation to exchange expertise and address challenges and opportunities of
research methods in MR user studies. By this, our workshop launches a
discussion of research methods that should lead to standardizing assessment
methods in MR user studies. The outcomes of the workshop will be aggregated
into a collective special issue journal article.
