# Do four-day work weeks improve productivity?: 34 Sourced Claims, Contested Facts & Evidence Authors: ronalddsoftdoes HTML: https://moyomap.com/maps/do-four-day-work Markdown: https://moyomap.com/maps/do-four-day-work.md License: HTML and markdown are for reading and citation. Bulk copying and AI training need a written license. See /terms and /developers#maps-data. Cite a claim as: MoyoMap, "Do four-day work weeks improve productivity?: 34 Sourced Claims, Contested Facts & Evidence", claim {id}, https://moyomap.com/maps/do-four-day-work.md#{id}. “Moyo, a product of SenTeGuard Inc.” ### A 2024 German trial of 45 organizations used hair-cortisol and smartwatch metrics to verify physical stress r… Id: claim_125a86aee1d42eaab3f7f4dd Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 A 2024 German trial of 45 organizations used hair-cortisol and smartwatch metrics to verify physical stress reductions. Labels: Inferred, Low, known ### Stanford University research indicates that worker productivity falls steeply after 48–50 weekly hours, with… Id: claim_375720d5d8c1dc8fee7a9b02 Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 Stanford University research indicates that worker productivity falls steeply after 48–50 weekly hours, with no cumulative output gain for those working 70 hours versus 56 hours. Labels: Source-linked, Low, known ### Most four-day work week pilot results are subject to selection bias because they involve organizations alread… Id: claim_4a6afe3abc70455d35a825ff Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 Most four-day work week pilot results are subject to selection bias because they involve organizations already predisposed to organizational reform. Labels: Contested, High, known ### In linear output, assembly manufacturing, and continuous healthcare environments, productivity cannot always… Id: claim_5bd5cf9a681ba967f7c32b88 Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 In linear output, assembly manufacturing, and continuous healthcare environments, productivity cannot always be compressed into fewer hours without capital improvements or hiring backfill staff. Labels: Inferred, Medium, known ### Icelandic public sector trials between 2015 and 2019 led to 86% of the national workforce gaining the right t… Id: claim_67bc0439bdf8361bc7c73e9e Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 Icelandic public sector trials between 2015 and 2019 led to 86% of the national workforce gaining the right to negotiate shorter hours. Labels: Inferred, Low, known ### A study of 141 companies and 2,896 workers across six countries found that a 32-hour workweek reduced burnout… Id: claim_a17e959f02e17046c6e5d92e Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 A study of 141 companies and 2,896 workers across six countries found that a 32-hour workweek reduced burnout scores from 2.83 to 2.38 on a 5-point scale. Labels: Inferred, Low, known ### Economist Dieter von Fintel argues that four-day workweek feasibility in emerging economies like South Africa… Id: claim_afed1e3b2ddc678206bc65a8 Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 Economist Dieter von Fintel argues that four-day workweek feasibility in emerging economies like South Africa is largely restricted to higher-wage services. Labels: Inferred, Medium, known ### In global 4 Day Week Global trials, 10% to 15% of workers stated that no amount of financial compensation wou… Id: claim_b2f3860613f6154e0442b464 Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 In global 4 Day Week Global trials, 10% to 15% of workers stated that no amount of financial compensation would persuade them to return to a five-day week. Labels: Source-linked, Low, known ### A 2015–2017 trial at a Swedish elderly-care center found that a 6-hour day cut sick days by 15% but required… Id: claim_c66e39e4b75e4af606df509f Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 A 2015–2017 trial at a Swedish elderly-care center found that a 6-hour day cut sick days by 15% but required hiring 14–17 additional nurses at a cost of ~€700,000 annually. Labels: Inferred, Medium, known ### Valencia Four-Day Week Experiment Id: section_2b5220505aeeeee64ab5fe8c Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 Valencia Four-Day Week Experiment Labels: Inferred, Low ### Portuguese Four-Day Workweek Pilot Id: section_ae3580c40ae90e4bdd8c19ab Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 Portuguese Four-Day Workweek Pilot Labels: Inferred, Low ### The 100:80:100 Model Definition and Mechanism Id: section_cb9b06ec1bc31768c3aeab4a Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 The 100:80:100 Model Definition and Mechanism Labels: Inferred, Low ### Compressed Workweek (4x10) Comparisons Id: section_efe0860f29fc8faac353a766 Parent: topic_37Iwy9jWp2pjByAMqpr3 Depth: 1 Compressed Workweek (4x10) Comparisons Labels: Inferred, Low #### Two large industrial manufacturing companies in the German trial withdrew because production-line volume drop… Id: claim_128777197cda92d450f30aec Parent: claim_125a86aee1d42eaab3f7f4dd Depth: 2 Two large industrial manufacturing companies in the German trial withdrew because production-line volume dropped and could not be compensated by meeting-reduction tactics. Labels: Inferred, Medium, known #### A month-long experiment in Valencia, Spain, moving holidays to 4 consecutive Mondays, reduced nitrogen dioxid… Id: claim_43d444cb037f909dffc35125 Parent: section_2b5220505aeeeee64ab5fe8c Depth: 2 A month-long experiment in Valencia, Spain, moving holidays to 4 consecutive Mondays, reduced nitrogen dioxide concentrations by 58% and self-reported stress by 35%. Labels: Inferred, Medium, known #### Compressed workweeks, such as four 10-hour days, do not yield the same restorative productivity gains as 32-h… Id: claim_44c07a3a0590d4fcf0ad41cc Parent: section_efe0860f29fc8faac353a766 Depth: 2 Compressed workweeks, such as four 10-hour days, do not yield the same restorative productivity gains as 32-hour reduced-workweek models. Labels: Inferred, Medium, known #### Participants in the University of Münster trial gained an average of 38 minutes of additional sleep each week. Id: claim_63d8993d3d2c6ee97108cff0 Parent: claim_125a86aee1d42eaab3f7f4dd Depth: 2 Participants in the University of Münster trial gained an average of 38 minutes of additional sleep each week. Labels: Inferred, Low, known #### In the German Münster study, 52% of participating companies shortened meetings and 65% reduced workday distra… Id: claim_7787b208917424419cab7fa2 Parent: claim_125a86aee1d42eaab3f7f4dd Depth: 2 In the German Münster study, 52% of participating companies shortened meetings and 65% reduced workday distractions to maintain productivity. Labels: Inferred, Low, known #### In knowledge work, tech, professional services, and municipal administration, trials of the 100:80:100 model… Id: claim_d6ea0c99ae0e18734ede5842 Parent: section_cb9b06ec1bc31768c3aeab4a Depth: 2 In knowledge work, tech, professional services, and municipal administration, trials of the 100:80:100 model show that worker productivity and company revenues remain stable or increase. Labels: Source-linked, Medium, known #### A Portuguese pilot across 41 companies found that reducing weekly hours to 34 hours decreased employee fatigu… Id: claim_e1f219dc1b7ad5eadb4886e9 Parent: section_ae3580c40ae90e4bdd8c19ab Depth: 2 A Portuguese pilot across 41 companies found that reducing weekly hours to 34 hours decreased employee fatigue by 23% and anxiety by 21%. Labels: Inferred, Low, known ##### During the Valencia four-day week experiment, retail shop associations reported up to a 20% decline in non-ho… Id: claim_046e7d57cc03b546af656f25 Parent: claim_43d444cb037f909dffc35125 Depth: 3 During the Valencia four-day week experiment, retail shop associations reported up to a 20% decline in non-hospitality retail sales on the extra free days. Labels: Inferred, Medium, known ##### In a six-month UK trial of 61 organizations, company revenue increased by 35% compared to similar historical… Id: claim_089e89bce52aeb87bfe62dda Parent: claim_d6ea0c99ae0e18734ede5842 Depth: 3 In a six-month UK trial of 61 organizations, company revenue increased by 35% compared to similar historical periods. Labels: Source-linked, Medium, known ##### During the Portuguese pilot, the percentage of employees struggling to balance work and home obligations drop… Id: claim_232c62d4ae49129b033398bf Parent: claim_e1f219dc1b7ad5eadb4886e9 Depth: 3 During the Portuguese pilot, the percentage of employees struggling to balance work and home obligations dropped from 46% to 8%. Labels: Source-linked, Low, known ##### A 2018 pilot at Perpetual Guardian in New Zealand showed an effective 20% hourly productivity gain and a redu… Id: claim_6c6665430525c2cdd0d32173 Parent: claim_d6ea0c99ae0e18734ede5842 Depth: 3 A 2018 pilot at Perpetual Guardian in New Zealand showed an effective 20% hourly productivity gain and a reduction in staff stress from 45% to 38%. Labels: Inferred, Low, known ##### In a South African trial of 28 companies, revenues increased by 10.5% on average and absenteeism dropped by 9… Id: claim_962262ce7d0081f66c84c03d Parent: claim_d6ea0c99ae0e18734ede5842 Depth: 3 In a South African trial of 28 companies, revenues increased by 10.5% on average and absenteeism dropped by 9%. Labels: Inferred, Low, known ##### In a 33-company trial across the US and Ireland, company revenues climbed 8% during the trial and 38% relativ… Id: claim_abcc69ffe3b900b28d4b028b Parent: claim_d6ea0c99ae0e18734ede5842 Depth: 3 In a 33-company trial across the US and Ireland, company revenues climbed 8% during the trial and 38% relative to the same period a year prior. Labels: Inferred, Low, known ##### South Cambridgeshire Municipal Council reported a 39% drop in staff turnover after adopting a 32-hour workwee… Id: claim_ac6452133ff8fa05308028e9 Parent: claim_d6ea0c99ae0e18734ede5842 Depth: 3 South Cambridgeshire Municipal Council reported a 39% drop in staff turnover after adopting a 32-hour workweek. Labels: Source-linked, Low, known ##### One year after the UK four-day week pilot, 89% of participating companies retained the four-day schedule. Id: claim_d0d2ade2c8f480e296f98e40 Parent: claim_d6ea0c99ae0e18734ede5842 Depth: 3 One year after the UK four-day week pilot, 89% of participating companies retained the four-day schedule. Labels: Inferred, Low, known ##### Utah's 2008–2011 mandatory 4x10-hour schedule for state workers saved only ~$500,000 in energy costs and was… Id: claim_efc4ab06e0ca207c5fdc9a3e Parent: claim_44c07a3a0590d4fcf0ad41cc Depth: 3 Utah's 2008–2011 mandatory 4x10-hour schedule for state workers saved only ~$500,000 in energy costs and was repealed due to public frustration and worker fatigue. Labels: Inferred, Medium, known ##### Microsoft Japan's 2019 four-day workweek trial resulted in a 39.9% year-on-year increase in sales per employe… Id: claim_fd21d8c8fea2f114a50fe39e Parent: claim_d6ea0c99ae0e18734ede5842 Depth: 3 Microsoft Japan's 2019 four-day workweek trial resulted in a 39.9% year-on-year increase in sales per employee. Labels: Source-linked, Low, known ###### South Cambridgeshire District Council saw a 120% to 123% increase in job applications after switching to a 32… Id: claim_156de41ca3737ea9c055d464 Parent: claim_ac6452133ff8fa05308028e9 Depth: 4 South Cambridgeshire District Council saw a 120% to 123% increase in job applications after switching to a 32-hour workweek. Labels: Inferred, Low, known ###### South Cambridgeshire Municipal Council reduced annual staffing overspend by between £371,500 and £399,263 by… Id: claim_8a6a83c743aaaa034be80a0d Parent: claim_ac6452133ff8fa05308028e9 Depth: 4 South Cambridgeshire Municipal Council reduced annual staffing overspend by between £371,500 and £399,263 by reducing reliance on agency staff. Labels: Inferred, Medium, known ###### The Greater Cambridge Shared Waste Service maintained a 99.89% on-time collection rate while operating on a f… Id: claim_a61bb8c0f5751383dd93632b Parent: claim_ac6452133ff8fa05308028e9 Depth: 4 The Greater Cambridge Shared Waste Service maintained a 99.89% on-time collection rate while operating on a four-day schedule. Labels: Inferred, Low, known ###### Cambridge University researchers observed a 65% drop in sick days taken across 61 UK organizations during the… Id: claim_b7a24e2dbb946e372c35ec9e Parent: claim_089e89bce52aeb87bfe62dda Depth: 4 Cambridge University researchers observed a 65% drop in sick days taken across 61 UK organizations during the 2022 four-day week trial. Labels: Inferred, Low, known