Track Your Results with Source Codes

Some catalogs prefer to build some intelligence into the code, while others simply use a sequential numbering system (i.e., alpha, numeric or a combination of the two). It’s best to avoid using certain letters, such as “I” (which can be confused for a 1) or “O” (might look like a 0). Avoiding these types of letters and/or numbers will reduce your non-traceable factor.