This excerpt taken from the SMG 10-K filed Dec 14, 2006.
Most of our revenue is derived from the sale of inventory, and we recognize revenue when title and risk of loss transfer, generally when products are received by the customer. Provisions for payment discounts, product returns and allowances are recorded as a reduction of sales at the time revenue is recognized based on historical trends and adjusted periodically as circumstances warrant. Similarly, reserves for uncollectible receivables due from customers are established based on managements judgment as to the ultimate collectibility of these balances. We offer sales incentives through various programs, consisting principally of volume rebates, cooperative advertising, consumer coupons and other trade programs. The cost of these programs is recorded as a reduction of sales. The recognition of revenues, receivables and trade programs requires the use of estimates. While we believe these estimates to be reasonable based on the then current facts and circumstances, there can be no assurance that actual amounts realized will not differ materially from estimated amounts recorded.