The rules of deduction remain the same, but the rules of evidence are subjective. Each person may have different individual perceptions. For example, a college student's record player was stolen. The student did not know that he was colorblind. A person's perception cannot be shared with anybody else except through communication.
Communication is fallible, subject to exaggeration, falsification, and misinterpretation.
In contrast to philosophies, religions, and ideologies dictated by some Authority, the Methodology for Subjective Perceptions encourages independent thinking. What we learn and who teaches us becomes important. As students, we can be accepting and unquestioning or we can be critical and questioning. When we are young, we are in the first category. We accept the opinions of others and adopt their philosophies without proof or questions.