More complex, diverse and innovative is the new norm in software products. To
handle that, teams need to be heterogeneous and capable of performing teamwork
-- challenging those in higher education to understand factors that motivate or
demotivate team-members. This article explores willingness and motivation of
students to perform teamwork in a dynamic context scenario. After analyzing the
team behavior in 60 real-world software projects, conducted in a software
engineering course, we identified the factors that influence teamwork in such a
dynamic context. These factors were used to create a model that can be reused
by other instructors.