u are right guys...to an extent i think. ex if you read in an article or somewhere that Dr A using method X measured glucose concentration in a diabetic patient to be say 30mM while Dr B using method Y,in same patient had 8mM. If you report this as such then thats a SURVEY( more or less retelling), but if u say Dr A's result was 30 while Dr B's was 8 [and add that]; the discrepancy could be DUE TO specificity/accuracy of the different methods etc-that now is CRITIQUING- a RE-view.