Monitors social trends in Germany. In addition, each data collection focuses on special topics of investigation. Basic demographic and socioeconomic data also are collected on the respondents, who are German-speaking persons 18 years of age and older living in private households in Germany. Conducted biennially since 1980 (with an additional survey in 1991), the ALLBUS series includes individual survey collections as well as a cumulative file. Cumulative ALLBUS contains variables for all questions administered on at least two different occasions in the framework of the ALLBUS individual studies. Before 1991, respondents were chosen from the Federal Republic of Germany and West Berlin only, and since 1991 from all of Germany.