When asked how a company does GTD, David Allen's answer is, "Holacracy." It's a self-organizing management framework that has GTD built in. The David Allen Company has been running on this framework since 2011. This recording on how GTD is incorporated into Holacracy's governing structure is from a presentation for the Holacracy community of practice. You can click this link to download the PDF that has GTD comments on the Holacracy constitution.