The theme dealt with in this article is non-isothermal kinetics of various processes in which multiple elementary processes are involved. Firstly fundamental equation of non-isothermal nucleation and growth process is derived and it is compared with isothermal fundamental equation. From the fundamental equation, method of kinetic analysis of data by constant rate heating or cooling is derived. Theoretical considerations are also made for parallel competitive reactions and consecutive reactions. For the former some simple relations useful to elucidate the process can be derived, but for the latter such a simple useful relation cannot be found, but a fundamental equation is derived for specific cases. Finally usefulness of temperature oscillation for analyzing reversible processes is discussed together with its application to a reaction of a single elementary process.