https://www.theguardian.com/world/2013/jul/14/obama-secret-kill-list-disposition-matrix
In truth, the matrix is more than a mere euphemism for a kill list, or even a capture-or-kill list. It is a sophisticated grid, mounted upon a database that is said to have been more than two years in the development, containing biographies of individuals believed to pose a threat to US interests, and their known or suspected locations, as well as a range of options for their disposal.
It is a grid, however, that both blurs and expands the boundaries that human rights law and the law of war place upon acts of abduction or targeted killing. There have been claims that people's names have been entered into it with little or no evidence. And it appears that it will be with us for many years to come.