A systematic review pulls scattered research into one list of what actually moves the needle.

Work From Anywhere has stopped being an emergency arrangement. Many companies now run office days and remote days side by side, and they want to know whether the mix works. That question needs evidence, and the evidence has been scattered across dozens of separate studies.

The authors used a Systematic Literature Review, the same approach medical researchers use to summarise a field. They fixed their search criteria before they started: keywords, publication years and journal quality. Then they screened candidates on topic and language, on abstract, and finally on full content.
Screening literature is usually a judgement call, and judgement drifts. To reduce that bias the team screened each paper twice and measured agreement between rounds using Cohen's Kappa. It makes a subjective process measurably more objective, and shows a reader how much trust to place in the selection.

Seventeen studies survived the full screening. From them the authors extracted eleven factors that influence employee productivity when work is not tied to a building.
Fauziyah et al. (2024). Factors Influencing Employee Productivity in Work From Anywhere: A Systematic Literature Review (SLR). Journal of Information Technology and Computer Science.
The list is broad on purpose, and that is the most useful thing about it. Productivity in a distributed setting is not one variable to optimise. It is a bundle of working conditions, personal circumstances and management practices that move together.
The authors frame the result as groundwork. Their goal is to model the business processes a company needs to evaluate and improve a Work From Anywhere system, and a needs analysis comes first.