H. Allcott, Social norms and energy conservation, Journal of Public Economics, vol.95, issue.9-10, pp.9-10, 2011.
DOI : 10.1016/j.jpubeco.2011.03.003

L. B. Andersen, Physical activity and health, BMJ, vol.334, issue.7605, p.1173, 2007.
DOI : 10.1136/bmj.39225.414537.80

G. Baker, N. Mutrie, and R. Lowry, Using pedometers as motivational tools: Are goals set in steps more effective than goals set in minutes for increasing walking?, International Journal of Health Promotion and Education, vol.34, issue.1, p.46, 2008.
DOI : 10.1080/14635240.2008.10708123

A. D. Berkowitz, The Social Norms Approach: Theory, Research, and Annotated Bibliography, 2004.

R. W. Bohannon, Number of Pedometer-Assessed Steps Taken Per Day by Adults: A Descriptive Meta-Analysis, Physical Therapy, vol.87, issue.12, pp.1642-1650, 2007.
DOI : 10.2522/ptj.20060037

B. Bosari and K. B. Carey, Descriptive and injunctive norms in college drinking: a meta-analytic integration., Journal of Studies on Alcohol, vol.64, issue.3, pp.331-341, 2003.
DOI : 10.15288/jsa.2003.64.331

D. M. Bravata, C. Smith-spangler, V. Sundaram, A. L. Gienger, N. Lin et al., Using Pedometers to Increase Physical Activity and Improve Health, JAMA, vol.298, issue.19, pp.2296-2304, 2007.
DOI : 10.1001/jama.298.19.2296

R. C. Brusso and K. A. Orvis, The impeding role of initial unrealistic goal-setting on videogame-based training performance: Identifying underpinning processes and a solution, Computers in Human Behavior, vol.29, issue.4, pp.1686-1694, 2013.
DOI : 10.1016/j.chb.2013.01.006

K. Burchell, R. Rettie, and K. Patel, Marketing social norms: Social marketing and the ???social norm approach???, Journal of Consumer Behaviour, vol.18, issue.1, pp.1-9, 2013.
DOI : 10.1002/cb.1395

URL : http://eprints.kingston.ac.uk/25204/

B. C. Choi, A. W. Pac, J. C. Choi, and E. C. Choi, Daily step goal of 10,000 steps: A literature review, Clinical & Investigative Medicine, vol.30, issue.3, pp.146-151, 2007.
DOI : 10.25011/cim.v30i3.1083

R. B. Cialdini and N. J. Goldstein, Social Influence: Compliance and Conformity, Annual Review of Psychology, vol.55, issue.1, pp.591-621, 2004.
DOI : 10.1146/annurev.psych.55.090902.142015

R. B. Cialdini, R. R. Reno, and C. A. Kallgren, A focus theory of normative conduct: Recycling the concept of norms to reduce littering in public places., Journal of Personality and Social Psychology, vol.58, issue.6, pp.1015-1026, 1990.
DOI : 10.1037/0022-3514.58.6.1015

S. Consolvo, P. Klasnja, D. W. Mcdonald, D. Avrahami, J. Froehlich et al., Flowers or a Robot Army? Encouraging Awareness & Activity with Personal, Mobile Displays, pp.54-63, 2008.

C. S. Dewa, W. Deruiter, N. Chau, and K. Karioja, Walking for Wellness: Using Pedometers to Decrease Sedentary Behaviour and Promote Mental Health, International Journal of Mental Health Promotion, vol.127, issue.2, pp.24-28, 2009.
DOI : 10.1097/00005650-199603000-00003

A. Groves, Using Pedometers as a Valid Method of Determining Physical Activity Intensity Level, Brigham Young University., Dept. of Exercise Sciences, 2008.

T. Harries, R. Rettie, M. Studley, S. Chambers, and K. Burchell, Is social norms marketing effective? A case study in domestic electricity consumption, European Journal of Marketing

R. Ilies and T. Judge, Goal Regulation Across Time: The Effects of Feedback and Affect., Journal of Applied Psychology, vol.90, issue.3, pp.453-467, 2005.
DOI : 10.1037/0021-9010.90.3.453

M. Iwane, M. Arita, and S. Tomimoto, Walking 10,000 Steps/Day or More Reduces Blood Pressure and Sympathetic Nerve Activity in Mild Essential Hypertension., Hypertension Research, vol.23, issue.6, pp.573-580, 2000.
DOI : 10.1291/hypres.23.573

E. M. Jackson and A. Howton, Increasing Walking in College Students Using a Pedometer Intervention: Differences According to Body Mass Index, Journal of American College Health, vol.57, issue.2, pp.159-164, 2008.
DOI : 10.3200/JACH.57.2.159-164

H. Jones, P. Millward, and B. Buraimo, Analysis of the Taking Part Survey, 2011.

M. Kang, S. J. Marshall, T. V. Barreira, and J. Lee, Effect of Pedometer-Based Physical Activity Interventions, Research Quarterly for Exercise and Sport, vol.33, issue.3, pp.648-55, 2009.
DOI : 10.1080/02701367.2009.10599604

M. A. Lewis and C. Neighbors, Gender-Specific Misperceptions of College Student Drinking Norms., Psychology of Addictive Behaviors, vol.18, issue.4, pp.334-339, 2004.
DOI : 10.1037/0893-164X.18.4.334

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.540.6638

J. Lin, L. Mamykina, S. Lindtner, G. Delajoux, and H. Strub, Fish???n???Steps: Encouraging Physical Activity with an Interactive Computer Game, LNCS, vol.4206, pp.261-278, 2006.
DOI : 10.1007/11853565_16

E. Locke and G. Latham, Building a practically useful theory of goal setting and task motivation: A 35-year odyssey., American Psychologist, vol.57, issue.9, pp.705-717, 2002.
DOI : 10.1037/0003-066X.57.9.705

E. Locke and G. Latham, New Directions in Goal-Setting Theory, Current Directions in Psychological Science, vol.78, issue.5, pp.265-268, 2006.
DOI : 10.1037/0003-066X.57.9.705

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.553.1396

G. Maclellan, L. Baillie, and M. Granat, The application of a physical activity and location measurement system to public health interventions to promote physical activity, Proceedings of the 2nd International Conference on PErvsive Technologies Related to Assistive Environments, PETRA '09, pp.1-8, 2009.
DOI : 10.1145/1579114.1579137

M. Mladenov and M. Mock, A step counter service for Java-enabled devices using a built-in accelerometer, Proceedings of the 1st International Workshop on Context-Aware Middleware and Services affiliated with the 4th International Conference on Communication System Software and Middleware (COMSWARE 2009), CAMS '09, pp.1-5, 2009.
DOI : 10.1145/1554233.1554235

J. Morris and A. Hardman, Walking to Health, Sports Medicine, vol.23, issue.5, pp.306-332, 1997.
DOI : 10.2165/00007256-199723050-00004

C. Pooley, M. Tight, T. Jones, D. Horton, G. Scheldeman et al., Understanding Walking and Cycling: Summary of Key Findings and Recommendations, 2011.

P. L. Schneider, D. R. Bassett, and D. L. Thompson, Effects of a 10,000 Steps per Day Goal in Overweight Adults, American Journal of Health Promotion, vol.21, issue.2, pp.85-89, 2006.
DOI : 10.4278/0890-1171-21.2.85

P. W. Schultz, J. M. Nolan, R. B. Cialdini, N. J. Goldstein, and V. Griskevicius, The Constructive, Destructive, and Reconstructive Power of Social Norms, Psychological Science, vol.49, issue.5, pp.429-434, 2007.
DOI : 10.1207/15324839951036533

J. D. Singer and J. B. Willet, Applied Longitudinal Data Analysis ? modelling change and event occurrence, 2003.

P. Steel and C. J. König, INTEGRATING THEORIES OF MOTIVATION., Academy of Management Review, vol.31, issue.4, pp.889-913, 2006.
DOI : 10.5465/AMR.2006.22527462

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.196.3227

R. Thaler and C. Sunstein, Nudge: Improving Decisions about Health, Wealth, and Happiness, 2008.

T. Toscos, A. Faber, S. An, and M. P. Gandhi, Chick clique, CHI '06 extended abstracts on Human factors in computing systems, CHI EA '06, pp.1873-1878, 2006.
DOI : 10.1145/1125451.1125805

C. Tudor-locke, B. E. Ainsworth, R. W. Thompson, and C. E. Matthews, Comparison of pedometer and accelerometer measures of free-living physical activity, Medicine & Science in Sports & Exercise, vol.34, issue.12, pp.2045-2051, 2002.
DOI : 10.1097/00005768-200212000-00027

R. Winnet, Guide to health: Nutrition and physical activity outcomes of a group-randomized trial of an internet-based intervention in churches, Annals of Behavioral Medicine, vol.28, issue.3, pp.251-261, 2007.
DOI : 10.1007/BF02879907