Previous research has shown that peer effects are important in many areas, including education (e.g. Sacerdote, 2001) and the workplace (e.g. Mas and Moretti, 2009). However the existing literature has made little attempt to disentangle possible mechanisms behind these peer effects. In this project, we attempt to disentangle some of these mechanisms using a lab experiment where laboratory participants can either see the results of other participants or know that their results can be seen by other participants or both. This will allow us to investigate whether peer effects are strongest for participants who know they are being watched or for participants that know the results of other participants or that peer effects require both directions to be active.