An estimation technique under which historical claimdata, such as the number and amount of claims for the subject block of business, are grouped into the time periods in which claims were incurred and the time periods in which they were paid. The development method uses these groupings to create a claimspayment pattern, which is used to help estimate the incurred claims.
Congratulations! You're now Froogled Up™ on Section 2.5 from ASOP 5!
Feel free to use it throughout your financial/insurance life.