Since the total project control approach was introduced in the first edition of Devaux's 1999 book by that title, others have extended both the theory and the practice. In 2013, Tomoichi Sato of JGC Corporation in Yokohama suggested an "extended DIPP" based on risk-based project value. He wrote: "The key concept of Simple DIPP is to obtain the ratio of expected income to cost ETC, neglecting sunk costs in the past. Using RPV instead of expected income, the author proposes a criterion "extended DIPP". This represents the ratio of remaining RPV to cost ETC. If there are project alternatives which are mutually independent, the one with the highest extended DIPP should be chosen... To maximize the project portfolio value of a company, extended DIPP can be used as criteria for prioritisation."8
Additionally, critical path drag calculation has been coded into project scheduling software, both in Spider Project and as an add-on product to Microsoft Project from Boyle Project Consulting, PLLC.9
*Devaux, Stephen A. (1999). Total Project Control: A Manager's Guide to Integrated Project Planning, Measuring, and Tracking (pp. xxiv–xxvi) New York, NY: Wiley. ISBN 0-471-32859-6. /wiki/ISBN_(identifier) ↩
William Duncan and Stephen Devaux "Scheduling Is a Drag" Projects@Work on-line magazine http://www.projectsatwork.com/content/articles/246653.cfm ↩
Stephen A. Devaux "The Drag Efficient: The Missing Quantification of Time on the Critical Path" Archived 2013-03-13 at the Wayback Machine Defense AT&L magazine of the Defense Acquisition University. http://www.dau.mil/pubscats/ATL%20Docs/Jan_Feb_2012/Devaux.pdf ↩
Stephen A. Devaux ["When the DIPP Dips: A P&L Index for Project Decisions"] Project Management Journal, Vol XXIII, No. 3, Sep 1992, pp. 45 - 49. ↩
Gary Heerkens "Eye on the Prize: The Business of Managing Projects" PM Network, June 2015, p. 72. http://www.pmnetwork-digital.com/pmnetwork/june_2015?pg=72#pg72 ↩
Joseph Sopko "Organizational Project Management: Why Build and Improve?" PMI white paper, 2015, p. 20. http://www.pmi.org/~/media/PDF/learning/organizational-project-management-build-improve.ashx ↩
Sopko "Organizational Project Management: Why Build and Improve?" PMI white paper, 2015, p. 19. http://www.pmi.org/~/media/PDF/learning/organizational-project-management-build-improve.ashx ↩
Dr. Tomoichi Sato "Risk-based Project Value Analysis – Contributed Value and Procurement Cost" http://www2.odn.ne.jp/scheduling/RVAnalysis/ProMAC2006%20Sato.pdf ↩
Thomas Boyle "Drag Calculation in BPC Logic Filter for Microsoft Project" http://www2.odn.ne.jp/scheduling/RVAnalysis/ProMAC2006%20Sato.pdf ↩