Usually, the driving factor is bulks of paper documents the HR department suffered from, forced remote work, real-time feedback, role-based control, the order in document management storage, talent management, etc.
Also, there are visible adoption phases based on the number of employees. It refers to peaks of 1-25 employees, 26-50, 51-100, 101-250, 251-500, and so on, so forth when it is the best time to implement HR software of particular feature coverage.