Partial table of contents:; ISSUES IN THE MANAGEMENT OF UNCERTAINTY; A Survey of Uncertain and Approximate Inference (R. Neapolitan); Rough Sets: A New Approach to Vagueness (Z. Pawlak); ASPECTS OF FUZZY LOGIC: THEORY AND IMPLEMENTATIONS; LT-Fuzzy Logics (H. Rasiowa & N. Cat Ho); On Fuzzy Intuitionistic Logic (E. Turunen); On Modifier Logic (J. Mattila); FUZZY LOGIC FOR APPROXIMATE REASONING; Presumption, Prejudice, and Regularity in Fuzzy Material Implication (T. Whalen & B. Schott); Inference for Information Systems Containing Probabilistic and Fuzzy Uncertainties (J. Baldwin); FUZZY LOGIC FOR KNOWLEDGE REPRESENTATION AND ELICITATION; Approximate Reasoning in Diagnosis, Therapy, and Prognosis (A. Rocha, et al.); Elementary Learning in a Fuzzy Expert System (J. Buckley); KNOWLEDGE-BASED SYSTEMS USING FUZZY LOGIC; Structured Local Fuzzy Logics in MILORD (J. Agustm, et al.); The Validation of Fuzzy Knowledge-Based Systems (A. Chang & L. Hall); FUZZY LOGIC FOR INTELLIGENT DATABASE MANAGEMENT SYSTEMS; Fuzzy Querying in Conventional Databases (P. Bosc & O. Pivert); Index.