“…We chose the longitudinal case study method as a research method, which provides a unique window into "a system of interest with its structure, dynamics, pathologies, and promise" (Aligica and Tarko, 2014). It enriches and generalizes the theory by combining theoretical knowledge with practical observations (Yin, 1994;Rindzevičiūtė, 2021). Case studies are used for the discovery, describing and mapping of relationships, but they may also be used for theory testing (Woodside and Wilson, 2003;Gummesson, 2005), theory illustration (Siggelkow, 2007), hypothesis development (Tellis, 1997), prediction (Woodside and Wilson, 2003) and the identification of further research requirements (Siggelkow, 2007).…”