An informal Workshop was held under the auspices of the JET Joint Undertaking, Abingdon, UK on 9 and 10 December 1986 to discuss the options available for making experimental measurements on alpha-particles in D-T plasmas. There were 57 participants, 26 from European laboratories, 10 from the United States, 2 from Japan and the remainder from JET. All the presentations were by invitation. There will be no official Workshop Proceedings. As discussed in the Introductory talk (Keilhacker, JET), the study of alpha-particle production, confinement and consequent plasma heating is one of the main objectives of the JET Project. The motivation for holding the Workshop was to present and assess the experimental techniques which could be applied to the investigation of alpha-particle phenomena in d-t plasmas for such machines as JET, TFTR and CIT. The role to be played by conventional diagnostic techniques was not overlooked, but attention was naturally focussed on methods specific to the presence of alpha-particles and for which the feasibility has yet to be established.