We develop an algebraic theory for the top-down design of communicating systems in which levels of abstraction are represented by algebras, and their stepwise refinements are represented by homomorphisms. Particular attention is paid to the equational specification of these levels of abstraction. A number of examples are included for illustration, most notably a top-down design for a communication protocol. © 1985.
Bergstra, J. A., & Tucker, J. V. (1985). Top-down design and the algebra of communicating processes. Science of Computer Programming, 5(C), 171–199. https://doi.org/10.1016/0167-6423(85)90010-3