He refers to the variation in sp or writ. influenced by the social context.The focus is on the way lag s used in particular situation. PERSONAL/IMPERSONAL, CASUAL/INTIMATE, IMPROVISED/REHEARSED, POLITE/COLLOQUIAL...-Elements like syntax, voc. , morph, phonl, prag. rules may vary dep. on register.Non-ling. prescriptions such as appearance: dress codes, body lg. and proximity of speakers...