ISO/PAS 19450:2015

ISO/PAS 19450:2015 specifies Object-Process Methodology (OPM) with detail sufficient for enabling practitioners to utilise the concepts, semantics, and syntax of Object-Process Methodology as a modelling paradigm and language for producing conceptual models at various extents of detail, and for enabling tool vendors to provide application modelling products to aid those practitioners.
While ISO/PAS 19450:2015 presents some examples for the use of Object-Process Methodology to improve clarity, it does not attempt to provide a complete reference for all the possible applications of Object-Process Methodology.