There are much greater differences, however, in how firms screen candidates before hiring. Some firms use computer testing to evaluate candidates, while others supplement this with psychological evaluations or personal interviews to select temps for the right jobs. If you need a temp with specific skills, computer matches are usually adequate, but personal interviews can help ensure that workers are better suited for your needs. Pricing Temp firms generally charge a fixed percentage greater than the hourly cost of a worker. Skilled temps tend to be much more expensive.
Most firms offer discounts off their published rates.
Even if you plan to use temporary services infrequently, it is usually worth negotiating rates upfront to reduce the overall cost. Also, if temporary workers will be hired for a specific long-term project, see if you can provide training without being charged for their time. Ask about guarantees from services for the workers they place. Reputable services generally guarantee satisfaction, waiving fees for workers who do not work out. If security is of concern, see that the service is bonded to cover the theft or destruction of property by temporary workers.