  The focus on psychology has increased within software engineering due to the
project management innovation "agile development processes". The agile methods
do not explicitly consider group development aspects; they simply assume what
is described in group psychology as mature groups. This study was conducted
with 45 employees and their twelve managers (N=57) from two SAP customers in
the US that were working with agile methods, and the data were collected via an
online survey. The selected Agility measurement was correlated to a Group
Development measurement and showed significant convergent validity, i.e., a
more mature team is also a more agile team. This means that the agile methods
probably would benefit from taking group development into account when its
practices are being introduced.
