Coordination has long been recognized as contributing to successful IT projects. Agile software development provides many practices for achieving project coordination in small co-located projects. Given the importance of coordination to successful software development projects and the increasing popularity of agile software development, investigating coordination in this context is timely and potentially useful. This paper takes an existing theory of coordination in co-located agile software development projects developed from case study research and proposes a field test of that theory. The question addressed is what is the effect of an agile coordination strategy on coordination effectiveness in co-located software development projects? This paper describes the initial theory of coordination and a research design for field-testing that theory.