In this study we investigate the behaviour and the performance of expe
rimental subjects, who had to solve a series of tasks of 'strategic th
inking' under a stress and a non-stress condition. No significant diff
erences between the conditions could be found with respect to performa
nce and improvement of performance within the series of tasks, but the
experimental subjects exhibited under the different conditions differ
ent forms of behaviour. Unexpectedly the Ss working under the stress-c
ondition exhibited a more 'analytical' behaviour and increased their w
orkload, instead of decreasing it. Additionally they exhibited a tende
ncy for measures with salient effects and proved to be better in findi
ng the right points of main effort. The results are discussed with res
pect to a general theory of action regulation.