Whilst there are both positive and negative experiences associated with caregiving, it is the negatives that are more likely to impact on subjective quality of life. A number of literature reviews have concluded that studies have consistently found that mental illness produced significant burden and distress in family members. Subjective quality of life is a concept used to reflect individuals' judgements of satisfaction with a number of areas of their life. Such judgements of life satisfaction, or subjective quality of life, are a useful tool for describing the well-being of various populations and monitoring change within populations. Hence, subjective quality of life can be used to evaluate the effectiveness of programs and policies.