Habermas claims that communication rests upon a non-egoistic understanding of the world, which is an idea he borrowed from thinkers like Jean Piaget. A subject capable of a de-centered understanding can take up three fundamentally different attitudes to the world. Habermas refers to such attitudes as "dimensions of validity". Specifically, this means individuals can recognize different standards for validity—i.e., that the validation of an empirical truth claim requires different methods and procedures than the validation of subjective truthfulness, and that both of those require different methods and procedures of validation than claims to normative rightness.