This thesis builds on current understanding of trust, competitive program design, and collaboration in the context of private land conservation. Results from laboratory experiments suggest that trust enhances collaborative behaviour compared to distrust, irrespective of whether or not the program has a competitive design. When participants do not have prior interaction experience, non-competitive programs encourage more collaborative behaviour than competitive programs. Overall, competitive collaborative programs perform better when trust is present, compared to when it is not. Trust-building - and hence, collaboration - may be shaped by both collaborative activities with a different partner, and repeated activities with the same partner.