| − | Experiments in which the participants do not know whether or not they are a part of the control group.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc.
| + | '''Blind studies''' are experiments in which the participants do not know whether or not they are a part of the control group.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc. |