1. validity
   1. construct validity
      1. convergent
         1. refers to the degree to which two measures of constructs that theoretically should be related
            1. correlation
            2. proximité ds la qualité du modele
            3. baseline
            4. new
         2. correlation between
            1. constructs
            2. factors in construct
      2. descriminant validity
         1. tests whether concepts or measurements that are supposed to be unrelated are, in fact, unrelated.
         2. formula
   2. concurrent validity
      1. exemple :
         1. correlation with clinical behavior
   3. predictive validity
      1. = concurrent validity with time
2. reliability
   1. Inter-rater reliability
   2. Test-retest reliability
   3. Inter-method reliability
   4. Internal consistency
      1. cronbach's alpha
         1. latent factor
         2. each subscale
         3. formula