Effects of a Smartphone-Based Positive Reflection Diary on Work Engagement Among Japanese Workers: Randomized Controlled Trial

Masahito Tokita   ¹ , MSc ;   Shuichiro Kobayashi   ² , BA ;   Daisuke Miyanaka   ^{3, 4} , MPH ;   Nobuyuki Takate   ⁵ , MA ;   Hiroyuki Nakano   ⁵ , BA ;   Kazuki Takeuchi   ⁶ , MA ;   Akihito Shimazu   ⁴ , PhD

¹ Keio University, Keio Research Institute at SFC, Fujisawa, Japan

² Faculty of Environment and Information Studies, Keio University, Fujisawa, Japan

³ Better Options, Inc, Tokyo, Japan

⁴ Faculty of Policy Management, Keio University, Fujisawa, Japan

⁵ Japan Productivity Center, Tokyo, Japan

⁶ Labor Trust LCC, Tokyo, Japan