Actions are part of the way that the mind controls the body. Two fundamenta
l psychological questions about actions are 'Where do they come from?' and
'How does the mind produce them?' These may be called the 'internal generat
ion problem' and the 'information expansion problem' respectively The impor
tance of these questions was appreciated at the birth of the British Psycho
logical Society (BPS) a century ago, though the experimental methods to stu
dy them were lacking. This article falls into two halves. The first half di
scusses some of the major epochs in the psychology of action over the last
100 years; the second half outlines some currently prominent research quest
ions, and considers their historical antecedents. Finally, I offer some spe
culations regarding where future contributions to the psychology of action
will be most fruitful.