1.
Stability.
2.
Equivalence.
3.
Internal consistency.
1-
Stability.
(“test-retest”):
the degree to which two scores on the same instrument are consistent over time.
2-
Equivalence.
(“equivalent
forms”): the degree to which identical instruments (except for the actual items
included) yield identical scores.
3-
Internal Consistency.
(“split-half”
reliability with Spearman-Brown correction formula , Kuder-Richardson and
Cronback’s Alpha reliabilities, scorer/rater reliability): the degree to which
one instrument yields consistent results.
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any suggestion on my side