This pamphlet is a report of a study of motivation among adults learning Welsh in Wales. It is claimed that the situations in which a language is likely to be used and the linguistic aim of the learners should be taken into consideration when the nature of the vocabulary to be included in a second language course is determined. Recent research work in vocabulary selection for second-language learning in France, Canada, and Ireland is reviewed. The study aimed at discovering, by means of a questionnaire issued to 113 classes of adults learning Welsh, the purpose for which the language was being learned and the situations in which the newly acquired command of the language is most likely to be used. It was found that the most frequently mentioned reasons were concerned with a desire to be able to follow news and other programs on television in Welsh and to be able to participate in social intercourse through the medium of the language. It is recommended that the planners of courses in Welsh as a second language for adults pay special attention to the vocabulary needed for understanding television news bulletins and for understanding and participating in everyday conversations among Welsh-speaking friends. (Author/TL)