System quality attributes like explainability, trans-
parency, traceability, explicability, interpretability, understand-
ability, and the like are given an increasing weight, both in
research and in the industry. All of these attributes can be sub-
sumed under the term of “perspicuity”. We argue in this vision
paper that perspicuity is to be regarded as a meaningful and
distinct class of quality attributes from which new requirements
along with new challenges arise, and that perspicuity as a require-
ment is needed for legal, societal, and moral reasons, as well as
for reasons of consistency within requirements engineering.