To create the mortise for the biscuit, a biscuit joiner is usually required. There are other methods of cutting the slot, such as a slot cutter bit in a router, but the biscuit joiner is the most common. Accuracy is not as important in the creation of these mortises as the biscuit joint is designed to allow a bit of flexibility during glue up. The mortise must be located at the correct distance from the face of the joint in both members but the width of the mortise is not as critical.