对原型进行内部评估，以验证设计和可行性。测试产品/服务原型以确认其符合设计和可用性标准。证实设计的可行性，并验证其生产的可行性。确定任何需要改进的领域。 Carrying out an in-house appraisal of the prototypes in order to validate design and feasibility. Test the product/service prototypes to confirm their compliance with design and usability standards. Corroborate the viability of the design, and validate the feasibility of their production. Identify any areas for improvement.