This excerpt taken from the PGI 10-Q filed Nov 7, 2008.
Allowance for Doubtful Accounts
Our allowance for doubtful accounts represents reserves for receivables that reduce accounts receivable to amounts expected to be collected. Management uses significant judgment in estimating uncollectible amounts. In estimating uncollectible amounts, management considers factors such as historical and anticipated customer payment performance and industry-specific economic conditions. Using these factors, management assigns reserves for uncollectible amounts by various accounts receivable aging categories to specific customer accounts.