 Many face perception and memory tests have been developed and used by researchers in the past including the Warrington Recognition Memory for Faces, Benton Facial Recognition Test and later, The Cambridge Face Perception Test and Cambridge Face Memory Test, which were developed in order to address the shortcomings of the first two tests.The Warrington Recognition Memory tests "contain abundant non-internal facial feature information" and the Benton Facial Recognition Test allows the test subject to "rely on feature matching strategies using the hairline and eyebrows rather than recognizing the facial configuration".The Cambridge Face Perception Test allows participants to look at a target face, while ranking 6 other faces according to their resemblance to the target face.