<p>Despite
qualitative evidence suggesting that changes in informal hierarchy strength
likely impact performance, informal hierarchy strength changes have received
little theoretical or empirical attention. We address this by extending structural
adaptation theory (SAT) to develop and test a theoretical model of why informal
hierarchy strength changes and how those changes impact performance. Building
on SAT’s principle that teams can become more ordered following stimulation, we
propose that pressure subsequently increases informal hierarchy strength. In
project teams where pressure starts low and increases at the midpoint, informal
hierarchy should weaken early in project life and strengthen after the
midpoint. We also extend SAT’s asymmetric adaptability principle to consider
not just the direction but also the rate of the changes. We hypothesize that sharply
strengthening informal hierarchy harms performance, but informal hierarchy
strengthening gradually improves performance. SAT also implies that gradual
change is promoted by inclusive discussions. Because most influential extraverts
tend to squelch inclusive discussions where most influential neurotics tend to be
inclusive, teams with most influential extraverts strengthen their informal
hierarchy quickly where teams with most influential neurotics strengthen their informal
hierarchy gradually. We find support for our theoretical model using
longitudinal data and client performance ratings on self-managed project teams.
Our results contribute to SAT by showing its application to informal, unplanned
changes and introducing the rate of change to its asymmetric adaptability
principle. Our findings also highlight the importance of shifting informal
hierarchy strength research away from the predominant static approach and
towards studying informal hierarchy strength changes.</p>