The goal of this low-risk interventional study is to analyze participants' assessment of colorectal cancer screening program through screening method preference and experience after FOBT analysis in screaned participant population for colorectal cancer; could include any of the following: both sexes, age 50-69 years, asympthomatic volunteers. The main aims to answer are:

• Values of experience of participants into screening programme.
• Values of preferences of participants for screening methods.

Participants will answer two questionnaires and they'll be given their information and clinical data to investigator or health personnel.

Inclusion Criteria:

• Participants ages from 50 to 69 years (both included) at the time of informed consent signed.
• Participants invited to participate in population-based screening programme who are eligible to undertake FOBT at the Primary Health Care Center.
• Participants should sign an informed consent. They must understand the nature, significance, implications, and risks of the clinical study before signing the informed consent form.

Exclusion Criteria:

• Participants who have not delivery a stool sample in the Primary Health Care Center before signing the informed consent form.
• Participants with a previous colonoscopy in consequence of a FOBT positive result.
• Participants who are in a dependent personal or non-medical relationship with the Sponsor or the Investigators.