Once you have identified your assumptions, risks, and benefits, you need to validate them with evidence and data in order to verify their accuracy and relevance. To do this, conduct research and analysis on your project context, such as the market, the industry, the competitors, the customers, or the regulations. You can use various sources of information to gather and analyze data that supports or challenges your assumptions, risks, and benefits. Additionally, it is important to consult and collaborate with stakeholders such as team members, sponsors, clients, or end-users. You can use various methods of communication to solicit and incorporate their input and feedback on your assumptions, risks, and benefits. Finally, review and revise your assumptions, risks, and benefits based on the evidence and data that you have collected as well as the feedback that you have received. You may need to add, remove, or modify some of them depending on how they match or differ from the reality and expectations of your project.