Many reserving techniques require assumptions regarding expected ultimate losses and LAE. Actuaries may track average prices, frequency and severity trends, legal, demographic, and other economic factors and trends. In the case of reinsurance, the reserving actuary is further removed from the underlying insurance policies and must make similar types of assumptions with less direct information and for business assumed from multiple primary insurers with varying markets. This session will explore assumptions and methods that can be used to estimate the effects of the underwriting cycle on reserving parameters.