  Business process modelling languages typically enable the representation of
business process models by employing (graphical) symbols. These symbols can
vary depending upon the verbosity of the language, the modelling paradigm, the
focus of the language, and so on. To make explicit the different constructs and
rules employed by a specific language, as well as bridge the gap across
different languages, meta-models have been proposed in literature. These
meta-models are a crucial source of knowledge on what state-of-the-art
literature considers relevant to describe business processes. The goal of this
work is to provide an extensive systematic literature review (SLR) of business
process meta-models. This SLR aims at answering research questions concerning:
(i) the kind of meta-models proposed in literature; (ii) the recurring
constructs they contain; (iii) their purposes; and (iv) their evaluations.
