One only has to look at two national programs to understand the legitimacy of Elsie's remarks. Repeal and replace failed to correct any of the problems associated with health care, yet evaluate and modify has made social security one of the most durable and successful government  programs ever. Look at the private sector for example of how this all works, When a contractor is building a school or a bridge for an example and at 3/4 to completion encounters a mistake in design do they tear down the project and start over or do they execute a change order and finish the project?