The protocol provides all the background information for how the calculator has been developed and the technical details of each data entry calculation. It is a simple document that is essential to read and understand if you want to use the carbon calculating tool effectively. It is advised that you print the document and have it at hand when ensuring that you have collected the correct information to be entered in to the calculator. It is also useful to use while entering the data online as it will provide the context, assumptions and technical information to guide you while you are using the tool.