Development and validation of Vellore Inventory of Life Skills among people with severe mental illness

Rehabilitation for people with severe mental illness is incomplete without life skills assessment and intervention. The aim of the study was develop a culturally specific performance-based measure assessing life skills of patients with severe mental illness.

The items for the Vellore Inventory of Life Skills (VILS) were drawn after consultation with a reference group and from existing standardized scales. The items were categorized into two sections with six components each, which was further hierarchically arranged into activities at either basic, intermediate, or advanced level. One hundred consecutive clients between 18 and 60 years of age who provided written informed consent were assessed on the Comprehensive Evaluation of Basic Living Skills (CEBLS) and the VILS to evaluate convergent validity and inter-rater reliability. The General Health Questionnaire (GHQ-12) was used to evaluate divergent validity. The assessments were repeated after a week to evaluate test-retest reliability.

The scale had good inter-rater reliability 0.938 (95% confidence interval [CI] 0.887-0.967) and test-retest reliability 0.907 (95% CI 0.865-0.937). The correlation between total score of VILS and CEBLS (Pearson's correlation coefficient [PCC] = 0.611; P = 0.001) suggested moderate convergent validity. The correlation between total score of VILS and GHQ-12 (PCC = -0.260; P = 0.105) implied good divergent validity.

Preliminary data suggest that the VILS is clinically useful for the Indian population.