Reliability and operational validity
questionnaire to a sample of residents and asks them to evaluate road surfaces,
repair quality, and amount of traffic. He finds the results of limited value,
so he assigns engineers to travel through the neighborhoods to rate the roads.
The engineers are given general instructions but no written rating forms. Still
dissatisfied, he develops a rating form that lists the number of potholes per
mile, the depth of potholes, the thickness of asphalt, the width of the roadway
and similar measures.
(a) Comment on the reliability and operational validity of
each approach.
(b) Which approach would you consider the most operationally
valid? Comment on the ways each approach could be modified to improve its
reliability and validity.
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