One step in a design sprint planning process is to review previous sprints. A design sprint is a structured process for developing and testing new product ideas, and it typically involves a series of sprints or short periods of intense work. Reviewing previous sprints is important to identify what worked well and what didn't, and to learn from past experiences in order to improve the process for future sprints. This can involve reviewing feedback from customers, analyzing data on product performance, and gathering feedback from team members who participated in previous sprints.
While reviewing new technologies and calling in experts may be important steps in the design sprint planning process, they are not typically the first step. The final step, building the final product, typically comes after the planning and testing phases are complete.