Abstract
Certain qualitative design rules are formulated in the high-level notation of APL for implementation on an interactive computer terminal. This paper describes a set of design rules for verification of the structural potential of high order systems with regard to the properties of controllability and observability. For each property two independent tests must be performed. One is a graph-theoretical test establishing a necessary topological reachability property. The other is a combinatorial test providing a necessary algebraic property called term rank. The execution of these tests are illustrated by APL terminal sessions the layout of which is planned as a designer's guide for an investigation and, in case of failure to meet the tests, a possible redesign of the system. The idea being that the terminal outputs provide a self-documentary appendix to the design documents on the system.
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