Tervashonka's research focuses on several subject areas: philosophy of science, methodology, systematic analysis, intellectual history and, particularly, theory history. Main interests vary from the histories and philosophies of talented people, thinking systems, and the labour of intuitive processes.

The study of theory history is not just a history of theory but an understanding of how theories were thought and visioned and what skills were needed to get there. Every study like that can be a pedagogical case study regarding historical world-class talents nurturing and making an effect on the academic improvement of the world.

Methodology mainly focused on practical and theoretical applications of systematic analysis. Tervashonka gave the following definition for the method in 2021:

"Analyses are conducted in a cohesive manner which logically permits the formation of a rational synthesis of the subject matter, thereby explaining it systematically."

Paper: Meta-analysis of five systematic analysis papers from Finland, 2021.

Methodological connectivities can be made in tandem between systematic analysis and other methods. Also establishing not only a collection of thoughts on the method but also publishing an extensive record of the philosophy of science, scientific coverage, theoretical usability, and practical limitations of systematic analysis.

Regarding intellectual history and philosophy of science, we greatly benefit from extensive studies of thinking systems and idea-creation tools of those who have created schools of thought or any other extensive body of knowledge. Intellectual history can be a record of how different difficulties have been faced in the history of humankind. Depending on the connectivity and nature of the problems, we can always use progressively old ideas in tandem with new ones.