Introduction to the Special Issue in Honor of Peter Wakker.

It is well known that Peter prefers cumulative prospect theory (e.g., Diecidue and Wakker [27]; Fennema & Wakker, [32]). Many of Peter's later papers were inspired by Schmeidler ([60]) (e.g., Sarin & Wakker, [59]; Trautmann & Wakker, [62]; Wakker, [72], [75]). In the late 1980s and early 1990s, Peter wrote several clarifying works on how additive separability across mutually exclusive events can be derived (Chateauneuf & Wakker, [18]; Wakker, [71], [73], [74]). Hans and Peter collaborated on several projects in the 1980s and 1990s, particularly related to revealed preference and bargaining (e.g., de Koster et al., [24]; Peters & Wakker, [55], [54]; Wakker et al., [80]) with an occasional excursion to quality of life measurement (Miyamoto et al., [49]). [Extracted from the article]