The purposes of this research were to assess the educational sustainability of an educational project based on phases-based assessment and to assess the results of the educational project. The participants were stakeholders of the educational project and experts, who were acquired by purposive sampling. The instruments were the assessment forms of the educational sustainability and assessment results. The data were analysed by content analysis, mean and standard deviation. The research results found that the initial sustainability assessment focused on the feasibility and the sustainability assessment in progress towards sustainability also focused on the feasibility. The project had feasibility of sustainability at a very high level. The true sustainability assessment focused on true sustainability, and the project had true sustainability at a very high level. In addition, all the standards of model assessment consisted of feasibility, propriety, accuracy and utility, which were at very high levels for all the models.