怎么样 (zěn me yàng) is a pronoun asking 'how?' about a condition or state, or 'how about?' for a suggestion. It differs from 怎么 (zěn me), which asks 'how (in what way)?' or 'why?', and from 怎样 (zěn yàng), which is more formal and can also mean 'what kind of'. 怎么样 is the everyday choice for checking on someone or proposing an idea.