The 13 papers collected here were presented at the Workshop on Data Documentation held at Reisenburg Castle, Federal Republic of Germany, in July 1975. This workshop was a first attempt to identify some of the problems in the field of data documentation, formulate them, and solve them as far as possible. The subject was approached from four different viewpoints: (1) from the point of view of a documentalist, and from documentation theory; (2) the EDP as the most important tool with a strong influence on the documentational concept itself; (3) management and organizational aspects; and (4) presentation of existing data documentation systems in such areas as chemistry, medicine, steel and iron materials, and personal data. Additional special topics addressed included statistical methods for data documentation and confidentiality of personal data. These papers were written for readers with advanced knowledge in at least one of the subjects touched on by data documentation. The proceedings conclude with a bibliography based on the citations of the authors, a bibliography from the German Society for Medical Documentation and Statistics, and searches from the Central Library for Documentation of the German Society of Documentation and some smaller sources. (Author/JPF)