One example of how ingenuity is used conceptually can be found in the analysis of Thomas Homer-Dixon, building on that of Paul Romer, to refer to what is usually called instructional capital. Human ingenuity is also included in many school systems, with most teachers encouraging students to be educated in human ingenuity. The full exploration of these ideas in meeting social challenges is featured in The Ingenuity Gap[1], one of Thomas Homer-Dixon's earliest books.