<prompt> Reliability meansNumber of times the same results on repeated trialsNumber of times variation is seenExtent of accuracyLevel of simplicity  <response>: ref: Park;s 23rd edition pg138 Reliability repeatability precision: that is test must give consistent results when repeated more than once on the same individual or material, under the same conditions. note: Validity or accuracy: given by sensitivity and specificity. Diagnostic power or Predictablity: includes positive and negative predictive values. in order to include or exclude the person. 