VALIDITY: Truthfullness of data from an instrument.

1.Content Validity:How well the instrument measures the content domain, namely objectives.

2.Criterion-related Validity:The degree which two or more instruments measure the

same variable.

3.Construct Validity:The degree which the instrument measures a variable as the literature describes it.

RELIABILITY: Consistency or Dependability of the data from an instrument.

1.Internal Consistency:Distributed item difficulty. Estimated using Split-half, Kuder- Richardson(KR) formulas, Cronbach alpha procedures or Spearman Brown Coefficients. A large correlation coefficient usually r=.70 or better is considered to disclose internal consistency. (For individuals Intrarater or intrascorer reliability and for panels i nterrater or interscorer reliability is tested)

2.Stability:Related results from the same instrument at different times.

3.Equivalence:Scores from the instrument alligns with a parallel or alternate form of instrument.