However, the firm's study found that claims surrounding Sept. 11 have raised questions not contemplated by underwriters and adjusters prior to the attack, which have yet to be answered.

Among the unresolved issues, it noted, is how to evaluate liability for business interruption claims for businesses that were not in the proximity of the events of Sept. 11.

Also undetermined, PWC said, is how to measure the period of interruption and how to differentiate such losses from the changes in the post-Sept. 11 economy and whether it is necessary to do so.

Business losses that easily exceed policy limits will be paid quickly in the next six months to one year, while complex claims, which are litigated, might drag on for four-to-six years, PWC's report said.

According to the report, future business interruption policies might restrict terrorism exposures through narrowing limits of liability, increased deductibles, selective underwriting, and other means.

Business interruption rates, PWC found, are increasing between 30 percent and 200 percent depending upon the loss experience of the insured. Deductibles in some cases, PWC said, have increased 10 times that of last year's levels.

The study found that since Sept. 11, some insurance industry advocates are stressing that future policies should more clearly define terms such as "terrorism," "uninsurable," and "uninsured political risk," as well as distinguishing insured perils from uninsured elements.

PWC said these industry members were also suggesting that policies limit business interruption coverage to the direct consequence of physical damage from an insured peril, and not include as many possible consequences as are contemplated today.