According to Gardner, splitting intelligence into multiple categories was necessary because:

According to Howard Gardner's theory of multiple intelligences, the rationale for dividing intelligence into various categories stems from the recognition that success in life is not solely dependent on traditional measures of intelligence, such as IQ tests. Gardner identified several distinct types of intelligences—such as linguistic, logical-mathematical, spatial, musical, bodily-kinesthetic, interpersonal, intrapersonal, and naturalistic—arguing that these diverse intelligences reflect different ways of processing information and developing skills.

This framework acknowledges that individuals may exhibit strengths in areas beyond what conventional IQ measures assess. For instance, a person may possess exceptional musical talents or interpersonal skills that are not accurately captured by standard intelligence testing. By recognizing this diversity, Gardner aims to promote a more comprehensive understanding of human potential, which can lead to better educational practices that cater to different learning styles and talents.

Overall, Gardner's perspective emphasizes that intelligence is multifaceted and that various abilities contribute to a person's overall effectiveness and success in different environments, thus validating the need for a broader definition of intelligence.