Previous studies investigating the success of electronic and mobile government service delivery (EMGSD) have identified the factors that promote or mitigate against realisation of the benefits of such delivery. Models have lacked formality and have generally ignored the complexity of relationships between factors and factor sets. The studies have generally been concerned with EMGSD in a developed country. This paper reports on research-in- progress to address these areas. A preliminary formal model is presented with indicative examples of modelled relationships, together with a brief description of how the usefulness of the model will be validated for developing countries.