\item 2011--2012. Attracting Participants to user communities.
\item 2008--2012. Introduction to free software and open source.
-\item 2008--2012. Hackers: What they do, and why they do it.
+\item 2008--2012. Hackers: What they do, and why they do it
+\item 2011. Designing for Cooperation with Social Incentives.
\item 2008--2010. Revealing Errors: What errors can teach us about technology and power.
\item 2010. Free election technologies.
\item 2008. Disasters and Free Software.