Can we 100% objectively measure subjective experience? What are the foreseeable difficulties in retrieving the hidden truth?

2)    What is a Clinical dialogue circle? What matters to its importance in deciding the diagnosis and subsequent treatment approach?
3)    Can we 100% objectively measure subjective experience? What are the foreseeable difficulties in retrieving the hidden truth?
First part: Try to tap into the importance of a clinical interview and its implication to further diagnosing a patient having which kind of disorders
Second part: Find literature that how each part of functions is being found to be governed by try to set up an argument to whether we can tell everything about a person and understand and measure completely his thinking process (subjective thinking and experience) then counter argue and say that its IMPOSSIBLE as in technological means and empathetical means
Third part: List out the possible disorders or degeneration that may affect a persons subjective reality and memory then list out also what difficulties may the clinician face when extracting the subjective truth from the patient which could be countertransference that the clinician may have on the patient, or subjective judgement that may be affected by education, places of growing up etc.