It is important to evaluate last because it allows for a more objective and informed analysis of the material being evaluated. When we form an opinion before reading, we are more likely to interpret information in a way that confirms our preconceived notions or biases, rather than considering the evidence on its own merits. Evaluating last allows us to first gather and analyze all of the information, and then come to a conclusion based on that information. This can lead to a more thorough and accurate evaluation, and can also help to identify any potential biases or assumptions that may have influenced our initial thoughts.