1. Introduction

Unitary multiset grammars (UMG) and multimetagrammars (UMMG) are knowledge representation model, providing convergence of classical operations research and modern knowledge engineering. The main area of UMG/UMMG application is assessment and optimization of large-scale sociotechnical systems (STS). Syntax and semantics of multigrammars are described in the first part of this work, being separate chapter of this book. Section 2 of this chapter contains primary description of UMG/UMMG-improved algorithmics, providing generation of terminal multisets (TMS), reduced by unperspective branches cutoff at the maximal early steps of generation. Such branches do not lead to the TMS, satisfying all conditions, entering filter of UMG/UMMG. Section 3 is dedicated to UMG/UMMG application to some actual problems from the STS assessment area (estimation of producing STS capabilities and resources, necessary to such systems for various orders completion, as well as assessment of STS sustainability and vulnerability to various destructive impacts, such as natural disasters, technogenic catastrophes, mutual sanctions, etc.). In Section 4, optimization problems, related to STS, are considered (their profit maximization and works' optimal distribution among nonantagonistic competing STS in the market economy). Conclusion contains list of directions of further development of multigrammatical approach.
