Advisory Committee on Human Radiation Experiments AGENCY SEARCH PROCESS The Advisory Committee on Human Radiation Experiments (ACHRE) was asked to evaluate information concerning the federal government's role in sponsoring or conducting scientific and medical experiments using ionizing radiation involving human subjects. The original expectation was that the agencies identified as members of the interagency working group were those that had pertinent records and that would be looking for and providing documents for ACHRE review and evaluation. It rapidly became obvious, however, that information about what programs had existed, where they had been located, and who had been responsible, did not exist at a single location or in any summary form and, in fact, that information about what records existed generally was uneven. Reconstruction of these histories thus became necessary before focussed records retrieval could be possible. Furthermore, it also became clear that understanding these histories also required information from other government agencies and from non-federal institutions. Relevant records were of course required to reconstruct these histories, so that the development of historical understanding and records retrieval and evaluation evolved jointly and in parallel, and were, indeed, recursive. For these reasons, the search process by necessity became a joint effort of the agencies and ACHRE. The search process has generally focussed on establishing the scope of activity (for example, who was involved, over what period of time and where, with what support and what results) and the policy context in which such activities took place (for example, who made decisions and choices, what were the policies and who enforced them), rather than on assembling a complete record of particular experiments. The limited time allotted to ACHRE and the complexity of the records have meant that the efforts of the agencies and the Advisory Committee have not exhausted all the possibilities either for locating records of interest or for evaluating and cross-referencing identified records. With the cooperation of the agencies and many non- federal individuals and institutions, however, ACHRE has been able to assemble as much information, or information about information, as could be acquired, so that the essential components of these histories are no longer lost. .