ADT implementation and completion by induction from examples -- An association of Algebraic term nets and abstract data types for specifying real communication protocols -- The specification language GSBL -- Composition of algebraic high-level nets -- A match operation for rule-based modular system design -- Towards object-oriented algebraic specifications -- Inductive completion for transformation of equational specifications -- A notion of implementation for the specification language OBSCURE -- Model-theoretic specifications and back-and-forth equivalences -- Universal algebra in higher types -- Clausal rewriting: Applications and implementation -- Constraints for behavioural specifications -- Entities: An institution for dynamic systems -- A 2-category approach to critical pair completion -- A kernel specification formalism with higher-order parameterisation -- Extended ML: Past, present and future -- Dependent types considered necessary for specification languages -- Generic types in a language for data directed design -- Design of a compiler for lazy pattern driven narrowing.

The algebraic specification of abstract data types is now a well establishedresearch topic in computer science. This area influences both applications and theoretical foundations of methodologies which support the design and formal development of reliable software. The Seventh Workshop on Specification of Abstract Data Types took place in Wusterhausen/Dosse, April17-20, 1990, and was organized in cooperation with the ESPRIT Basic Research Working Group COMPASS. The main topics covered by the workshop were: - Modularization - Object orientation - Higher-order types anddependent types - Inductive completion - Algebraic high-level nets.