FLISP - a language for processing fuzzy data. The paper describes a new programming language (called FLISP) which provides a number of facilities for efficiently representing and manipulating fuzzy knowledge. Defined as an extension of standard LISP, it is based upon fuzzy sets and fuzzy logic theories. the language contains a collection of fuzzy-set operations and procedures for solution fuzzy relational equations with triangular norms. FLISP forms a plausible tool for implementation and examination of fuzzy control algorithms. The syntactic aspects of FLISP, the data structure and the statement structure will be described.