A comparison among three methods of rating physical effort required by refinery tasks



Journal Title

Journal ISSN

Volume Title



Frequency, importance, and effort ratings on physical tasks were obtained from a sample of process technicians in a large oil refinery. Physical ability test scores were collected. Three physical effort rating methods were tested. Criteria for evaluation of effort rating methods included: high reliability, freedom from common rating errors, and freedom from contamination by raters' own strength. Reliabilities for all methods were judged adequate. Differences in reliabilities among methods were not practically significant for the number of raters in the study. All methods were acceptable in terms of leniency/severity error. Rater physical strength biased effort ratings for all methods, but not to the degree expected. Contrary to expectations. Own Effort ratings were least biased by rater physical strength. The overall recommendation was to use the Own Effort rating method for obtaining reliable effort information. Potential problems and implications of the results for job analysis were discussed.



Work--Physiological aspects, Petroleum refineries