“Vendor tiering” is defined by Staffing Industry Analysts’ online Lexicon of workforce solutions ecosystem terms as a model in which vendors are invited to fill positions in a well-defined order and often with time triggers. For example, a temporary vacancy will go to tier 1 vendors first, and then to tier 2 vendors if not filled within a certain time period.

As the ecosystem evolves, SIA’s mission is to keep the language current for professionals in the space.