Purpose:
In this study we are interested in comparing the relationships that twins have with each other. We will examine how this relationship is different or the same for: 1) identical and fraternal twins, 2) male and female twins, and 3) twins at different ages.  We are also interested in studying twins' relationships with their friends, especially their closest friend of the same sex and their closest friend of the opposite sex.

Study Procedures:
If you agree to participate in this study, you will be given a questionnaire package that includes questions about the people in your life who are close to you (acquaintances, friends, and close friends), and your relationship with your twin, your best friend of the same sex and your best friend of the opposite sex. In addition you will be asked to complete a short questionnaire to determine whether you are an identical or a fraternal twin. In total, this questionnaire package should take you no more than 45 to 60 minutes to complete. For your time and inconvenience you will be given $10 once your questionnaire has been returned.

Confidentiality:
Any information collected through the questionnaires will be kept confidential. The information from these questionnaires will be coded using an identification number, and all questionnaires will be filed in a locked filing cabinet. Furthermore, your name will not be released to anyone, and it will not appear in any report, oral presentation, or publication for this study.

Voluntary Participation:
Your participation in this study is entirely voluntary. You may refuse to participate, refuse to answer any questions or withdraw from the study at any time. There are no known physical or psychological risks associated with participating in this study.

Contact:
If you have any questions or concerns about this study, please contact Andrea Foy or Dr. Vernon. We would be happy to answer any questions that you have and will provide you with a summary of the study's results once they are available.

View the results of the study.