  Previous research demonstrates that the interruption of immersive experiences
may lead to a bias in the results of questionnaires. Thus, the traditional way
of presenting questionnaires, paper-based or web-based, may not be compatible
with evaluating VR experiences. Recent research has shown the positive impact
of embedding questionnaires contextually into the virtual environment. However,
a comprehensive overview of the available VR questionnaire solutions is
currently missing. Furthermore, no clear taxonomy exists for these different
solutions in the literature. To address this, we present a literature review of
VR questionnaire user interfaces (UI) following PRISMA guidelines. Our search
returned 1.109 initial results, which were screened for eligibility, resulting
in a corpus of 25 papers. This paper contributes to HCI and games research with
a literature review of embedded questionnaires in VR, discussing the advantages
and disadvantages and introducing a taxonomy of in-VR questionnaire UIs.
