You are working on a new project to develop a new wireless product with ease-of-use features recommended by customers. It is as yet undetermined which features and the extent to which each feature will be incorporated into the product. You have a focus group that will continue to evaluate the features as the project goes forward. The focus group is authorized to suggest changes, as are your engineers and the quality department. As a project manager, what will help you most to minimize the effect of these changes?