Raw data analysis of an age-stage, two-sex life table, incorporating variable development rates among individuals, is described, using data obtained from rearing the potato tuberworm,Phthorimaea operculella(Zeller) (Lepidoptera: Gelechiidae). The intrinsic rate of increase is calculated with respect to both sexes. The stable age-stage distribution, stable age distribution, and the stable stage distribution are also calculated. Different results are obtained when the same data are analyzed using the traditional age-specific life table (Leslie matrix or Birch's method). These differences occur because the traditional age-specific life table deals only with female populations and does not take variable development rates among individuals into account. The relationship between the net reproduction rate and mean female fecundity in the age-stage, two-sex life table is described by a simple formula.