PRO-FORMA is to provide in advance to a prescribed form or to describe item, e.g. pro forma financial statement or pro forma invoice.
PAYMENT ON ACCOUNT see ON ACCOUNT.
SERVICE LEVEL AGREEMENT (SLA) is performance objectives reached by consensus between the user and the provider of a service, or between an outsourcer and an organization. A service level agreement specifies a variety of performance standards that may or may not include "service level."
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