A university study reported that between 1975 and 1983 the length of the average workweek in a certain country increased significantly  A governmental study, on the other hand, shows a significant decline in the length of the average workweek for the same period
Examination of the studies shows, however, that they used different methods of investigation; thus there is no need to look further for an explanation of the difference in the studies' results
recognize that two different methods of investigation can yield identical results