TY - JOUR AB - For reasons of technical convenience, current retrieval algorithms based on probabilistic reasoning are derived from models that assume patrons evaluate documents using a two value relevance scale. This paper extends the theory by describing a model which includes a more general relevance scale. This model permits a re‐examination of the earlier theory as a special case of that developed here and leads to a more satisfying interpretation of the ranking principle of the earlier models. VL - 39 IS - 2 SN - 0022-0418 DO - 10.1108/eb026739 UR - https://doi.org/10.1108/eb026739 AU - BOOKSTEIN ABRAHAM PY - 1983 Y1 - 1983/01/01 TI - OUTLINE OF A GENERAL PROBABILISTIC RETRIEVAL MODEL T2 - Journal of Documentation PB - MCB UP Ltd SP - 63 EP - 72 Y2 - 2024/09/20 ER -