Co-authored with Neil Cousins of Five Oceans Environmental Services Limited, the Sustainability Indicator is a software package that can be easily accessed and distributed for common use across sectors and geographical areas. The Indicator is being made available for free on a Windows platform where it can be stored on desktops for everyday use and should be used in conjunction with the guidance document. The use of the Sustainability Indicator allows for a structured and systematic approach to the determination of sustainability.