Despite the significance of site supervisors, there are concerns that their training has been inadequate and issues relating the characteristics of site supervisors’ tasks to training have not been adequately researched into. The study aims to develop training models from the task characteristics of site supervisors with the view to improving training practices in construction firms. Based on the literature review, a conceptual framework consisting of ten task characteristics variables and four training variables was developed. The research design adopted was a cross-sectional survey design with a quantitative approach. 257 questionnaires were purposely distributed to site supervisors working in construction firms in Nigeria and 218 valid questionnaires were returned and used for the analysis. The result shows that there is a significant positive relationship between task characteristics and training. Based on this, the study developed training models from the task characteristics of site supervisors. The study concludes that the prevalent nature of site supervision tasks predicts training practices in construction firms. This study contributes to knowledge by developing training models from task characteristics of site supervisors. Construction firms should therefore adopt the training models as a policy for effective training practices and for improving the performance of site supervisors.