Whilst preparing a presentation on the benefits of PPT and how it extends beyond construction I sought out a diagram for the 1:5:200 ratio. This is often shown in a whole life cycle management diagram usually shown as a growing series of bubbles.
If the initial construction costs of a building is 1, then its maintenance and operating costs over the years if 5 and the business operating costs (salary of people working in that building) is 200.
However when looking into this I came across the following paper which raised doubt on the accuracy of this ratio.
Exposing the Myth
I am still looking to see if there has been any response since this publication as the diagram is still “in circulation”. It does still do the job of focusing the mind on downstream aspects of building/construction whilst putting PPT into a much more far reaching envelope of influence and potential.
http://en.wikipedia.org/wiki/1:5:200 (the font of all conjecture)