Description: The report begins with Tan's paper Source-of-Earnings Analysis under FAS97 Universal Life Accounting that defines a procedure for analyzing the sources of profit. This paper extends the analysis to consider the effect of actual experience varying from expected and the effect of those variances on assumptions for the future. Also the paper illustrates examples of the effect of changing future assumptions or unlocking on the magnitude and incidence of profits and amortization. A discussion of the paper follows. From Transactions of Society of Actuaries 1990, Vol. 42.