osoblje koje se zapošljava prema potrebi za određeni period vremena

seasonal job - sezonski posao
seasonal workers - migrant workers

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Note added at 4 days (2009-01-24 19:49:21 GMT)
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Izgleda da postoji i contigent staffing i temporary staffing, a da temporary staffing spada u continegnt staffing, ili se misli na zajednički termin osoblje na određeno vreme i privremeno osoblje.

Tamo gde piše da contigent workers nemaju ugovor, verovatno se misli da nemaju ugovor o radu.

Temporary and Contract Placement
Managing today’s contingent and temporary staffing is a time consuming and costly workforce task for many organizations. JobSpeed offers full-service, single source solutions as alternatives to traditional temporary staffing and vendor-on-premise programs. JobSpeed reviews all the details regarding your current and past contigent staffing usage to determine what level of service will be best provide a cost-effective and efficient supplemental workforce for your organization.

short-term [1-45 days] temporary staffing
long-term [ 1 month to 12 months ] temporary staffing
contract staffing (ovo osoblje ima ugovor)

http://www.myjobspeed.com/contract.html

Contingent Workforce: the word contingent means uncertain, accidental, chance, dependent, and unforeseen. Contingent work depends on the employer's immediate needs. Some employers are now using contingent workers to fill 30-80% of their jobs. Contingent workers do not have a contract or commitment for ongoing employment - the work is time-limited. These are not "permanent" jobs, but they could last for days or years.
http://74.125.77.132/search?q=cache:hmhVTW3KWWYJ:www.career....

traditional temporary-to-hire
short-term [1-45 days] temporary staffing.
long-term [45-180 days] temporary staffing.
http://www.instigatesolutions.com/page4.html