The traditional model of productivity, which was clearly defined in the industrial sector with quantitative measures and production systems, does not apply to knowledge work. In knowledge work, productivity is personal and cannot be measured the same way as producing tangible goods. Unlike industrial work, where efficiency improvements and clear production goals were the norm, knowledge work does not have such well-defined processes. The shift in mental models from industrial to knowledge work has led to a misconception that visible activity is a proxy for productivity, resulting in practices like working longer hours to appear busy. The misconception persists in discussions about productivity in knowledge work, where there is no clear metric to improve efficiency. This shift in understanding productivity is further driven by the front office and IT revolution that began in the 2000s.