Today we face many high­ly com­plex chal­lenges both nation­al­ly and inter­na­tion­al­ly. From secu­ri­ty of our infor­ma­tion net­works, to plan­ning for and man­ag­ing nat­ur­al dis­as­ters, to emer­gence of new infec­tious dis­eases, to social and polit­i­cal con­flict through­out the world, these chal­lenges are messy, and high­ly inter­con­nect­ed.