Directed Programming is a new generative programming technique developed by Christophe McKeon which is a generalisation of Grammatical Evolution (http://www.grammatical-evolution.org) allowing one not only to do GE, but also to do Genetic Programming (http://www.genetic-programming.org) in pure Ruby without explicitly generating a program string as output. DP even allows you to set up hybrids of GP and GE where part of a GE subtree is calculated using normal Ruby functions/operators/etc. via. GP. DRP is the first ever implementation of DP and is written in pure Ruby.