Before revision:  A method is then described in which a variable acting on the self-regulating terms of the community matrix enables one to determine the size of the key feedback that leads to a system's tipping point  .
After revision:  A method is then described in which a variable acting on the self-regulating terms of the community matrix enables one to determine the size of the key feedback that leads to a system's tipping point , or narrows down the search space .