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:
Concurrent Sentence Definition. Consecutive means one after another, concurrent means at the same time, so for the numbers you have given, the total would be 100, because the first 90 of the concurrent would tick off at the same time the 90 consecutive would, thus leaving a balance of 10. This Site Might Help You.