The authors present experimental investigations on expertise in interpreting. Novice and expert interpreters were compared on measures of ‘reading under delayed auditory feedback condition’, ‘shadowing’ and ‘verbal fluency’, all of which are aspects essential to language processing in interpreting. Whereas the expected result was that the two groups would differ on all three measures, actually they only did on the first one, but were indistinguishable on the shadowing task and the verbal fluency task. The authors speculate that the reason why expertise interpreters did not outperform the novices in the shadowing task is that they experience difficulties in “suppressing automated strategies and in adapting to changed processing requirements”. The advantage for the expertise interpreters on reading under the delayed auditory feedback condition was tentatively explained by “their being less dependent on monitoring their own output” and their “improved ability to process two inputs simultaneously and consciously allocating attention to one or the other”.