When an employer signs a check, it is endorsing the transfer of money from the business' account to the employee. The act of signing the check is considered an endorsement, and is considered proof of the intent of the payer to transfer funds to the payee.
This model was proposed by Howard Gardner in his 1983 book Frames of Mind: The Theory of Multiple Intelligences. Gardner articulated eight criteria for a behavior to be considered an intelligence.
The best known classification is that developed by the psychologist Stanley Smith Stevens, who proposed four levels, or scales, of measurement: nominal, ordinal, interval, and ratio.