James M. Morgan and Jeffrey K. Liker, authors of The Toyota Product Development System, Integrating People, Process and Technology (2006, Productivity Press), offer the following product development guidelines practiced by lean manufacturing pioneer Toyota:
Establish customer-defined value to separate value-added from waste.
Front-load the product development process to explore thoroughly alternative solutions while there is maximum design space.
Create a level product development process flow.
Utilize rigorous standardization to reduce variation, and create flexibility and predictable outcomes.
Develop a chief engineer system to integrate development from start to finish.