  The voluntary process of Wikipedia edition provides an environment where the
outcome is clearly a collective product of interactions involving a large
number of people. We propose a simple agent-based model, developed from real
data, to reproduce the collaborative process of Wikipedia edition. With a small
number of simple ingredients, our model mimics several interesting features of
real human behaviour, namely in the context of edit wars. We show that the
level of conflict is determined by a tolerance parameter, which measures the
editors' capability to accept different opinions and to change their own
opinion. We propose to measure conflict with a parameter based on mutual
reverts, which increases only in contentious situations. Using this parameter,
we find a distribution for the inter-peace periods that is heavy-tailed. The
effects of wiki-robots in the conflict levels and in the edition patterns are
also studied. Our findings are compared with previous parameters used to
measure conflicts in edit wars.
