[For the entire collection see Zbl 0561.00007.]
Observational procedures are characterised in terms of certain subsets of the Cartesian product \({\mathcal P}_*\times {\mathcal R}_*\) of free semigroups generated by a set of pointers \({\mathcal P}\) and a set of readings \({\mathcal R}\). Experiments, designs, objects, systems and states are defined in terms of pointer-readings. Temporal development in a non- relativistic setting is defined by a one-parameter semigroup of transformations of state-space.
Some formal analogies between the structure of observational procedures and the standard methods of quantum mechanics are discussed very briefly.