Action by Unanimous Written Consent of the Board of Directors in Lieu of a Special Meeting is a legal document that allows a board of directors to take action without holding a formal board meeting. This document must include the signatures of all board members in order for it to be valid. There are two types of action that a board can take by Unanimous Written Consent: Approval of a Matter or Amendment of Bylaws. With Approval of a Matter, the board can approve a resolution or other type of decision without the need for a physical meeting. Amendment of Bylaws requires the board to modify existing bylaws or create new ones. In both cases, the written consent must be properly documented in order for it to be legally binding.