reliability and validity in diagnosis and classification

Question 1

what is reliability in relation to schizophrenia?

Answer 1

the extent to which a finding is consistent
- extent to which psychiatrists can agree on the same diagnosis when accessing patients (inter rater reliability)
- for a classification to be reliable the same diagnosis should be made each time
- different psychiatrists reach some decision when assessing patients

Question 2

what is validity in relation schizophrenia?

Answer 2

the extent to which we’re measuring what we intend to
must consider the validity of diagnostic tools