Feeling is the Nominalization of the verb to feel. The word was first used in the English language to describe the Physical sensation of touch through either experience or perception. The word is also used to describe experiences, other than the physical sensation of touch, such as "a feeling of warmth". In psychology, the word is usually reserved for the conscious subjective experience of emotion. Phenomenology and Heterophenomenology are philosophical approaches that provide some basis for knowledge of feelings. Many schools of Psychotherapy depend on the therapist achieving some kind of understanding of the client's feelings, for which Methodologies exist. Some theories of interpersonal relationships also have a role for shared feelings or understanding of another person's feelings.