Complexity is one of the primary challenges in project management. The goal of this exploratory research is to investigate how a collaborative Web 2.0 tool called a wiki can help teams deal with complexity. To support this case study, we conducted fieldwork over a five-month period in a telecommunications company. During this period we observed the adoption of a wiki that was used as a collaboration platform to support an internal software development project. Data collection involved preliminary interviews, a mid-project survey, internal documents and participatory observation. The data were analyzed using Edgar Morin’s principles of complexity as a theoretical lens. Here we present a model of socio-technical wiki systems based on complexity and systemic theories and grounded in empirical observations of the workplace.