This report aims to assess questionnaire requirements for a potential longitudinal study of gambling in the UK. Any longitudinal study of gamblers will invariably have a number of research questions it wishes to address. The authors of the report considered that two key research questions which would be highly likely to form part of the basis of any longitudinal research on gamblers were: assessing people's motivations for gambling; and examining the reasons or triggers which make gamblers, and even non-gamblers, change their gambling behaviour. The key aim of this piece of work was to assess what questionnaire items and methods could be used to accurately capture this information by: a) undertaking a desk based review of international literature and data collection methods in these areas; b) performing secondary analysis of existing qualitative data to assess whether the themes and methods identified from the desk based review are representative of gamblers within the UK and to highlight potential gaps in knowledge emerging from the review stage. Following this two stage process, the authors recommended that the following questions and instruments be included within the second (question testing) phase of the project: (i) Age of first gambling experience. (ii) Facilitator of first gambling experience. (iii) Outcome of first gambling experience. (iv) Reasons for starting to gamble. (v) Gambling Motivations Questionnaire (vi) Changes in gambling behaviour since last interview. (vii) Reasons for changes in gambling behaviour.