A prospective study was undertaken to evaluate the efficacy of stimulated in vitro fertilization (SIVF) using Clomiphene Citrate and hMG in different infertilities. The analysis was applied to the first 81 cycles over a period of 9 months in the years 1994-1996 in Sheffield Fertility Centre (SFC). The female patients included in this study were under 40 years of age, and their FSH and LH values were < 10IU/L. Mild and moderate male factor infertilities were included. For tubal factor infertility 16 cases were included with an implantation rate of 0%. The unexplained factor infertility included 33 cases with an implantation rate per embryo transfer (ET) of 41%. For male factor infertility there were 18 cases with an implantation rate per ET of 42%. Out of 3 cases in the ovulatory factor group none reached ET with 0% implantation. For multiple factor infertility 11 cases were included with a 0% implantation rate. The overall implantation per embryo transfer was 27%, while the implantation per cycle started was 15%. We conclude that there are certain infertility factors, i.e. unexplained infertility and mild male factor, which can have good results in IVF using CC/hMG only.