Informed consent is the exchange of information between the researcher and a human subject to educate them so the person can make an informed decision whether or not to volunteer for the study.
It is considered best practice to provide potential subjects with written information explaining the purpose of the study and that it is considered research, or is part of a larger project. Providing a verbal description, or another format, is acceptable when prior approval from the IRB has been received. Below is a list of additional points to include, as applicable to your study, to assist subjects with their decision to participate:
Be sure to allow for ample time for the potential subjects to ask questions before giving consent, and reassure them that questions are allowed at any time throughout the course of the study. This will help them with their decision whether or not to participate in your study.