To use WCF as WCF Rest service you have to enable webHttpBindings. It support HTTP GET and POST verbs by [WebGet] and [WebInvoke] attributes respectively. To enable other HTTP verbs you have to do some configuration in IIS to accept request of that particular verb on .svc files.
Concurrent validity is a measure of how well a particular test correlates with a previously validated measure. It is commonly used in social science, psychology and education. Don't miss these related articles:
Validity based on relationships with other variables can be further classified by whether the two variables are measured at the same time (i.e., concurrent validity) or at different times (i.e., predictive validity). The focus of this study is concurrent validity.