“…These studies address theoretical and practical advances on personality in different populations and age groups, as well as the research findings of interventions and treatment strategies involving personality. Of the seven original research articles and one scoping review on personality included in this Special Issue, three are focused on healthy adult populations [ 1 , 2 , 3 ], two in healthy children and adolescent [ 4 , 5 ], other two in chronic pain conditions (migraine [ 6 ] and fibromyalgia [ 7 ]) and one in personality disorders (cluster B and C [ 8 ]). The variety of conditions, populations, personality traits and research methods used in the included studies makes difficult a direct comparison of the findings but provide a wider approach to personality, intervention, and psychological treatment.…”