This digest presents an overview of the Process Grammar Model, a framework for describing language use along a time axis through the distinction and continuum between Immediate Grammar and Adjustive Grammar. Immediate Grammar corresponds to intuitively selected and promptly realized utterances, while Adjustive Grammar involves deliberate judgment and revision. Rather than treating these as a simple binary opposition, the model conceptualizes them as dynamically interacting processes. This document serves as a concise entry point to the theoretical framework; for the full model and detailed discussions, see the main Process Grammar Model publication. Japanese version.