Intelligence tests are controversial, partly because they sometimes determine important aspects of peoples lives. For example, intelligence test scores have factored into determining school placement, identifying giftedness, and diagnosing mental retardation and learning disabilities. Even when an intelligence test shows that a child has normal intelligence, there might be speculation of a learning disability due to him or her falling behind in academic achievement. A childs biology and environment influences his or her academic achievement, as well. Children from different cultures and socioeconomic status have diverse experiences, beliefs, and attitudes that affect their academic achievement. There are also differences in skills that caregivers emphasize during a childs development that contribute to a childs school readiness, which influences intelligence and academic achievement.