This volume brings together for the first time a collection of studies devoted to missionary language learning and retention. Introductory chapters provide historical perspectives on this population and on language teaching philosophy and practice in the LDS tradition. The empirical studies which follow are divided into two sections, the first examining mission language acquisition by English-speaking missionaries abroad, the second focusing on post-mission language attrition. These chapters by internationally known scholars offer cutting-edge research using a number of different target languages in addressing various issues in second language development. Finally, a comprehensive bibliography of sources on mission languages is included. The readership of this pioneering work is expected to extend beyond specialists in study abroad and missionary language training to a broader audience of applied linguists, educators, and students interested in language acquisition and attrition. In addition, the book offers useful insights to adults who want to maintain a second language.