Have events that trigger entries into and exits from poverty changed over time? Using SIPP data, the authors compare poverty entries and exits in the 1988-92 period--prior to welfare reform--with the more recent 1996-99 period-after welfare reform. A comparison of these time periods show both similarities and differences. One difference is that employment changes are more important in the recent 1996-99 time period than in the 1988-92 time period. Also, shifts from two-adult to female-headed households and vice versa--measured while controlling for shifts in employment--became less important in poverty transitions over this time period.