Effects of an Acceptance-based Medication Adherence Therapy for Recent-onset Psychosis

Inclusion Criteria: * primarily diagnosed with psychosis (termed recent-onset), including brief, first-episode and other psychotic disorders according to the criteria of the DSM-V (American Psychiatric Association, 2013); * had the mental illness ≤5 years (defined as recent-onset psychosis in recent literature) * Hong Kong Chinese residents, aged 18-64 years; * Global Assessment of Functioning scores ≥51, indicating mild to moderate symptoms and difficulties in psychosocial/occupational functioning (American Psychiatric Association, 2013), thus being mentally stable to comprehend AIM\_AT and/or psychoeducation training; * Unsatisfactory medication adherence as indicated by the Adherence Rating Scale of \<2 (Hayward et al.,1995) during screening; and * Able to read/understand Cantonese/Mandarin. Exclusion Criteria: * Participated in/have recently been receiving other psychotherapies; * Having comorbidity of another mental illness (learning disability, cognitive or personality disorder) and/or clinically significant medical disease; and * Having communication and/or visual/hearing difficulty.