Sample size: TThe primary outcome is decisional conflict; the study requires 64 patients/arm to detect the minimal clinically important difference (MCID) of 0.3 using the Decisional Conflict Scale (DCS) (Appendix 3), assuming a standard deviation of 0.6, an alpha of 0.05 (two-sided) and power of 0.815,16. In the last 3 months, 244 patients with a family history of breast and colon cancer tested negative for their associated classic mutations (BRCA1/2, MLH, MSH, PMS, APC, MUTYH) most of who would be eligible for GS. Extrapolating this over the next 9 months we estimate that there would be 732 eligible patients. It is highly feasible to reach our target of 128 patients.