Introduction. Systems Process Theory (SPT) is Len Troncale’s attempt to build a general theory of systems not from a list of isomorphies but from the relations among them. The 1978 chapter identifies some fifty principal systems concepts — hierarchy, feedback, cycles, boundaries, emergence, and so on — and proposes “linkage propositions”: statements that one systems process requires, enables, constrains or is mutually influenced by another. The claim is that the explanatory content of systems science lies in these linkages, that they form a network of systems dynamics, and that they, not the isolated concepts, are what should be tested. Later work (Friendshuh and Troncale 2012, 2014) states criteria for admitting a candidate “fundamental systems process” — it must recur across physical, biological and social domains and survive tests of isomorphy — and proposes “virtual systems research”: computer-supported comparison of systems models against the catalogue. From the 2000s Troncale extended SPT into a “systems pathology” programme: if systems processes are universal, their characteristic failures should be too, and a knowledge base of such failures could serve systems engineering. That pathology programme is the point of contact with the VSM.
Important authors. Len R. Troncale is Professor Emeritus of Biology at California State Polytechnic University, Pomona, and a past president of the International Society for the Systems Sciences (ISSS), where the SPT work has mostly been presented. George Mobus (University of Washington Tacoma) and David Rousseau (Centre for Systems Philosophy) lead adjacent programmes on systems principles that cite and extend it. George Klir, who edited the 1978 volume, was the leading formal general-systems theorist of that generation.
Importance for cybernetics and the VSM. SPT shares the cybernetic ambition for cross-domain laws but works outside Beer’s tradition and does not cite it. Two things matter. First, SPT’s pathology work is a rival to the VSM’s own pathology literature (Pérez Ríos’s taxonomy): two systems-science traditions have independently built pathology catalogues, neither cites the other, and neither has been validated against organisational failure data. Second, SPT’s content is relational — process A constrains process B — which is exactly what the VSM’s channel and subgraph claims are, and what the VSM community has tended to strip away when it teaches the five systems as discrete boxes.
Importance for the article. §3.3 (rival pathology programmes) cites Troncale (1978) and Friendshuh and Troncale (2014) for the independent pathology programme, and says neither it nor Pérez Ríos’s taxonomy has been validated against failure data. The import is Applying new lenses (C5 §III, “Troncale — a rival pathology programme”), which makes the sharper point that linkage propositions are the relational claims the five-field schema cannot express. v02 answers that indirectly: §2.5 and §4.1 add edge, subgraph, dynamical and formal claim types to Field 1 after Variety and Channels Now (C4 §1, §11) made the same complaint from the network side. A reviewer will ask whether a receipt on a linkage proposition (“coordination constrains oscillation”) is actually writable in the revised schema, and the co-author should be able to show one. There is also a bibliographic hazard: v02’s reference list gives the 2014 Procedia paper the title of the 2012 ISSS paper; the source pages note the two must be disentangled before deposit.
Sources in the reading list.
- the definition of linkage propositions and the argument that they carry the theory’s content.
- the admission criteria for a fundamental systems process; compare with the VSM’s undeclared criteria for a “function.”
- the computational comparison proposal; also to settle which paper v02 means.
Other important sources and authors.
- Troncale, L. R. (1985). The future of general systems research: Obstacles, potentials, case studies. Systems Research, 2(1), 43–84 — Troncale’s own account of why general systems research stalled; relevant to §3.4’s diagnosis.
- Klir, G. J. (1969). An Approach to General Systems Theory. Van Nostrand Reinhold — the formal general-systems framework SPT positioned itself against.
- Mobus, G. E., & Kalton, M. C. (2015). Principles of Systems Science. Springer — the textbook consolidation of the principles-and-processes approach.
- Rousseau, D., Wilby, J., Billingham, J., & Blachfellner, S. (2018). General Systemology: Transdisciplinarity for Discovery, Insight and Innovation. Springer — the current programme for making systems principles testable, with SPT among its sources.
- Rousseau, D. (2018). On the architecture of systemology and the typology of its principles. Systems, 6(1), 7 — a typology of systems principles that could type Beer’s claims alongside Troncale’s.