Paid Leave Alone Won't Get Dads Home: How a Two-Hour Class Is Shifting Japanese Workplace Culture
Japan offers some of the most generous paternity leave policies in the world, allowing new fathers up to a year of paid time off. Yet, barely a third of eligible men actually use it. For decades, the prevailing logic among policymakers has been simple: if you fund it, they will come.
Japan's reality breaks that assumption wide open. When asked why they stay at their desks, fathers consistently point to the same culprit: workplace culture. The unspoken, unwritten rules of the office—not the employee handbook—call the shots.
However, a new discussion paper from the University of Tokyo’s Center for Research and Education for Policy Evaluation (CREPE) reveals that this entrenched culture can be shifted from the inside out. The secret? A surprisingly brief intervention.
The Experiment: Two Approaches to Changing Men's Minds
Researchers Mari Tanaka, Shintaro Yamaguchi, and their team conducted a controlled experiment across four typical Japanese organizations (two private companies and two municipal governments) between August 2023 and March 2024. Over 1,200 male employees across 80 offices participated.
The study tested two distinct workplace interventions to see what it takes to get fathers more involved:
1. The Interactive Training Session (The Deep Engagement Approach)
The Format: A two-hour online training session during paid work hours, developed by the nonprofit Fathering Japan.
The Setup: Managers and regular staff attended separate, simultaneous sessions so leadership and employees received the same message without awkward power dynamics.
The Content: Led by male instructors who were both successful professionals and active fathers, the curriculum covered the tangible benefits of paternity leave. Crucially, it forced men to confront a common blind spot: fathers routinely overestimate their household contributions compared to what their partners actually report.
2. The Information Flash (The Perception Correction Approach)
The Format: A quick, low-cost feedback session during a follow-up survey.
The Content: Non-management employees were shown data charts comparing what they thought their coworkers believed about paternity leave versus what those colleagues actually reported.
The Goal: To close the "social perception gap"—a phenomenon where people privately support an idea (like paternity leave) but assume their peers do not.
The Results: A Two-Hour Ripple Effect
The differences between the two approaches were stark. While simply correcting misconceptions did very little, the structured training program yielded massive returns.
What the Two-Hour Training Achieved:
More Time with Kids: Trained fathers reported an average increase of one additional hour of weekend childcare per day—a $16\%$ jump compared to the control group.
The Household Ripple Effect: This wasn't just fathers taking over tasks while mothers rested; total household childcare time increased. More remarkably, spouses of the trained men were able to work an additional 3.6 hours per week and cut back on their own housework.
Shifted Mindsets: Participants walked away with a stronger belief that paternity leave benefits the company, and a higher percentage actively began researching leave policies.
Why only weekend care?
Interestingly, weekday childcare remained unchanged. Because young children in Japan typically attend daycare during the week, fathers had rigid schedules. The surge in weekend care proved that the change was a deliberate, behavioral choice rather than just inflated survey reporting.
Why Just Giving Men the Data Failed:
The second program—showing men charts proving their coworkers were actually supportive—successfully closed the perception gap. Men realized their office wasn't as hostile to paternity leave as they thought.
But it changed absolutely no behavior. Knowing others are supportive wasn't enough to inspire action. The researchers concluded that deeper engagement—complete with visible role models, structured discussion, and an explicit green light from leadership—is required to move the needle.
The Takeaway: Culture is an Organizational Problem
The beauty of the two-hour training intervention is its scalability. It was entirely employer-funded, run during standard work hours, and yet it managed to alter how fathers spent weekends, how mothers spent their workweeks, and how the entire office viewed parental leave.
When generous government policies sit unused because of office stigma, the failure isn't just a political or legal one—it’s organizational. And as this study proves, organizations have the power to fix it.
Study Limitations & Details
While the results are promising, the authors note a few caveats:
Self-Reported Data: The findings rely on surveys, which can introduce bias (though researchers used anonymity and psychological validation scales to confirm the data held up).
Selection Bias: The four participating organizations had already volunteered to improve their paternity leave rates, and only about $12\%$ of total employees opted into the study.
Short Timeframe: The study tracked immediate shifts; it remains to be seen if these behavioral changes stick over several years.
Source: “Workplace Norms and Paternal Involvement in Childcare” (CREPE Discussion Paper No. 202, June 2026).