Traditionally, rigging is when large items are moved to an elevated height to allow construction to begin. Being a massive part of the building industry, rigging allows a number of difficult in addition to complicated jobs to be done a lot easier than previously. Even however it is very commonly used and in addition a big part of the construction of a lot of projects, rigging requires a strict oh&s code that will have to be adhered to. rigging instruction - http://equinopedia.com/index.php?title=Rigging_Basics