**5. Conclusions**

Systemology is a transdiscipline, which means that its principles and methods could in principle be useful across a wide variety of disciplines and problem contexts. However, as we have argued, these potential benefits are undermined by the lack of a consistent disciplinary terminology, which makes it hard to convey systems concepts to other disciplines. In fact, this lack can even make it hard to communicate between different systems specialisations. In this paper we have presented a conceptual framework for selecting and organising the terminology of systemology, and we call for a community effort to use this to develop an "Ontology for Systemology". We also offer the approach by which we arrived at this framework as an example of how the systems perspective can enrich other disciplines' methodologies.

**Author Contributions:** The project was conceived and managed by David Rousseau. David Rousseau, Julie Billingham and Javier Calvo-Amodio contributed equally to the research and the writing of the paper. David Rousseau prepared the diagrams.

**Funding:** Financial and material support for the project was provided by the Centre for Systems Philosophy, INCOSE and the University of Hull's Centre for Systems Studies.

**Acknowledgments:** We would like to thank the two anonymous reviewers of this paper for their helpful comments, which have greatly aided us in improving the structure and clarity of this paper.

**Conflicts of Interest:** The authors declare no conflict of interest.
