Shared Decision-Making for Colorectal Cancer Screening in High-Risk First-Degree Relatives Aged 40-49

Inclusion Criteria: * Age 40 to 49 years at the time of recruitment. * At least one immediate family member (biological parent, sibling, or child) has been pathologically diagnosed with colorectal cancer. * Able to read, understand, and provide prior consent. * Willing to be randomly assigned to any research group and complete all research procedures. Exclusion Criteria: * A personal history of colorectal cancer or inflammatory bowel disease (Crohn's disease or ulcerative colitis). * Presence of warning signs of colorectal cancer requiring diagnostic evaluation rather than screening (e.g., unexplained rectal bleeding, significant involuntary weight loss, persistent changes in bowel habits). * Presence of comorbidities that may contraindicate colonoscopy. * Having undergone colonoscopy within the past three years. * Inability to read, understand, and provide written informed consent.