support from gilroy et al
One strength of systematic desensitisation (SD) is the evidence base for its effectiveness.
Lisa Gilroy et al. (2003) followed up 42 people who had SD for spider phobia in three 45-minute sessions. At both three and 33 months, the SD group were less fearful than a control group treated by relaxation without exposure. In a recent review Theresa Wechsler et al. (2019) concluded that SD is effective for specific phobia, social phobia and agoraphobia.
This means that SD is likely to be helpful for people with phobias.