Assessment is a way of using psychological instruments to diagnose or to understand problems. Cognitive assessment can be used to understand the intellectual functioning of children-adults and is commonly used to diagnose learning disabilities/giftedness. Personality assessment is a means of understanding the way a person thinks and feels and is used for children-adults. Assessment is effective because it helps understand the psychological issues that someone experiences, and from there it can help formulate treatment plans that work on resolving the problems.