The Self-Sufficiency Project (SSP) is a Canadian social demonstration and research project designed to test an employment alternative to welfare. The SSP makes work pay by offering generous earnings supplements to long-term, single-parent welfare recipients who find full-time jobs and leave Canada's Income Assistance (IA) welfare system. The SSP's effects (both intended and unintended) were examined in a special study called the SSP Entry Effects Demonstration, which was based on a classic experimental research design. New recipients were randomly assigned either to: (1) a program group that was informed of SSP's earnings supplement and told that they could receive it if they remained on IA for 1 year, or (2) to a control group that was not eligible for supplement payments. Thirteen months later, the delayed exit effect of the new earnings supplement remained small (only 3.1%). Moreover, its effects grew only slightly over time. Even among those who were most knowledgeable about SSP's future earnings supplement offer, impacts remained fairly small, and SSP's 1-year eligibility restriction proved to limit both delayed exits from IA and new applicant entry effects. (Contains 10 tables/figures and 29 references.) (MN)