The primary geographical identification of all structures in a disaster should be the existing street name, building number and suburb, when possible.

During sector assessment, sites are identified where significant USAR operations (usually rescue work) is required. Once an address is identified as requiring further rescue work, it should also be given its own unique "Work Site Identification" number. An address that does not require further rescue operations does not receive a work site identification number.

Work site identification is determined using the following protocol:
* The first part is the sector letter allocated to the area the site is in (e.g. A).
* The second part is a number that is sequentially allocated to each worksite as identified (e.g. 1, 2, 3, etc).

Joining together the sector letter and allocated number produces the unique Work Site Identification e.g. A-1, A-2, A-3 etc.

If more than one team is in the same sector, then the emergency management authorities will instruct teams on which numbers to use e.g. Team 1 uses 1 to 20, Team 2 uses 21 to 40 etc.

A site where rescue operations are not required does not receive a Worksite ID.

It can be seen in Sector A that there are numerous rescue sites within one address. If this is the case, the entire property remains as one address, but the individual work sites within are identified as "A-1a, A-1b, etc". This may also be the case in very large buildings with seperate collapse areas.