“…Students' knowledge of graph theory has been proven as a powerful tool for understanding other disciplines: chemistry (Bruckler & Stilinović, 2008), physics (Toscano, Stella, & Milotti, 2015), or computer science (Kasyanov, 2001). However, few studies have researched students' reasoning about graph theory, as noted by Hazzan and Hadar (2005), and Medová, Páleníková, Rybanský, and Naštická (2019), although numerous works in multiple fields of mathematics point out the importance of studying students' reasoning to design effective tasks sequences or explain the success or failure of different teaching strategies (Brito, Almeida, & Osório, 2020;Chaphalkar & Wu, 2020;Hokor, 2020;Yao & Elia, 2021). These facts demonstrate the need to develop theoretical frameworks that support this type of research.…”