Payment accuracy and integrity involves several steps, and KLAS research finds that payer organizations normally use multiple vendors for different steps (i.e., pre-payment vs. post-payment) and for different capabilities (i.e., claims editing, payment recovery). Some vendors say they provide broad capabilities across most or all areas, while others focus on providing offerings for certain steps in the payment accuracy and integrity cycle. These solutions are typically used across all different lines of business. Historically, payers and vendors have focused on correcting under- or overpayments when they occur; more recently, the market has emphasized accuracy before payments are made.