The design development process for creating a product for a client begins with understanding the client's needs and goals through research and discussions. This is followed by brainstorming and conceptualizing initial ideas, which are then refined into more detailed designs. Prototypes are created for testing and feedback, allowing for adjustments and improvements. The design is then finalized, ensuring it meets both functional and aesthetic requirements, while also considering production feasibility and cost. Throughout the process, constant communication with the client ensures alignment with their vision and expectations.