The influence of the personality of asthmatic children and their mothe
rs on the course of their illness is analysed, taking as a basis a sam
ple of 48 asthmatic children. This is done through the assessment of t
he role of personality in the change that takes place, after the appli
cation of various psychological treatments (relaxation, systematic des
ensitization and stress inoculation) in three variables: number of day
s of illness, symptomatic relief drug use and school absences. The res
ults obtained highlight the influence of personality on therapeutic su
ccess. Consequently, this study shows the importance of tending to per
sonality traits in order to forecast and improve the effectiveness of
psychological treatment.