This paper presents two independently developed design methodologies: Environment-Based Design (EBD) and X-Development. These two methodologies share exactly the same foundation: design is based on environment. The environment is where the designed product is to work. The environment was there, is there, and will still be there. Any design action changes only the environment. This paper thus conducted a preliminary comparison of these two methodologies. This coincidental convergence of two design methodologies provides one kind of support to the each other. Future work will be focused on the formalization and refinement of X-Development through the mathematical operations included in the EBD.