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My dissertation research explores knowledge sharing behaviors among two teams of software developers, looking at how knowledge sharing may be effected by a team's choice of software development methodology. I conducted ethnographic observations with two product teams, one which adopted eXtreme Programming (XP) and one which used waterfall methods. Through analysis of 808 knowledge sharing events witnessed over 9 months in the field, I demonstrate differences across the two teams in what knowledge is formally captured (say, in tools or written documents) and what knowledge is communicated explicitly between team members. I then discuss how the practices employed by the programmers and the configuration of their work setting influenced these knowledge sharing behaviors. I then suggest implications of these differences, for both software development practice and for systems that might support software development work.