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Collaborative virtual assembly environment is a vital computer-aided design tool in product design and can be used as a learning and training tool. It helps in supporting complex product design by enabling designers to collaborate and communicate with other designers involved in the product design. This paper proposes a collaborative virtual assembly environment built in two phases for the immersive and non-immersive environments. Phase one was developed in Unity 3D using Virtual Reality Toolkit (VRTK) and Steam VR. Whereas, phase two was built using Vizard and Vizible. This work aims to allow scientists and engineers to discuss the concept design in a real-time VR environment so that they can interact with the objects and review their work before it is deployed. This paper proposes the system architecture and describes the design and implementation of a collaborative virtual assembly environment. The outcome of this work is to be able to resolve communication and interaction problems that arise during the concept-design phase.