Bunse, C.C.BunseKamsties, E.E.Kamsties2022-03-092022-03-091996https://publica.fraunhofer.de/handle/publica/326029It was claimed four years ago that the early phases of the software development life-cycle are not well supported in Cleanroom Software Engineering [22, 28]. To prove or to disprove such claims this article surveys the current state of techniques and methods used in the early phases in Cleanroom from a requirements engineers point of view. The survey is based on a systematically derived characterization scheme which is applied on a set of "published" Cleanroom (requirements-) techniques. The goal of this survey is twofold: First, to provide an overview of the current state in this area of Cleanroom tech niques for practitioners and second, to point out areas where further research is needed.encleanroomrequirements engineeringsoftware engineering004005006conference paper