How a project is designed generally impacts on project implementation and successful outcomes and satisfactory results. Thus, including the project team in the design process at an early stage is deemed necessary. The aim of this research is to understand the relationships between project design and the project team involvement within each project phase. Outcomes of the projects relating to the project designs and levels of involvement are analysed and discussed. The research results are based on survey questionnaires distributed to 75 respondents working in four health development projects in Thailand. The research data was statistically analysed using between-group analysis of variance and correlation analysis to examine differences between the studied groups and connections between research variables. The paper shows that project design and the team involvement associate to application of project management and implementation of project tools as well as other desirable managerial criteria of the studied projects. This research benefits future designs and implementation of health development projects especially in developing countries such as Thailand where improvement of project outcomes are required.