Assessing the potential environmental impacts of disturbance on protected species during and after the development process is a legislative requirement in most nations. However, the restrictions that this legislation places on developers are often based on limited ecological understanding, over-simplified methodologies, less-than-robust data and the subjective interpretations of field ecologists. Consequently, constraints may be imposed with no transparent methodology behind them to the frustration of, and occasionally large expense to, developers. Additionally, protected species numbers continue to decline and biodiversity continues to be threatened. This paper describes a GIS conceptual model for assessing ecological disturbance vulnerability, based upon a case study development in Scotland. First, uncertainties in traditional methods of recording and representing ecological features with GIS are reviewed such that they may be better accounted for in the disturbance model. Second, by incorporating temporal fluctuations in ecological behaviour into the disturbance susceptibility concept, it is argued that it is possible to synchronise development with conservation requirements. Finally, a method is presented to account for disturbance tolerances at the scale of the individual animal. It is anticipated that this model will enable environmental impact assessors to produce more robust analyses of wildlife disturbance risk and facilitate synchronisation between development and wildlife vulnerability to minimise disturbance and better avoid delays to the works programme.