Summary: A detailed analysis of a new nine parameter plate element, introduced recently by B. Specht
[Int. J. Numer. Methods Eng. 26, No.3, 705- 715 (1988; Zbl 0663.73082
)] is presented. It is shown that the mean values over the normal derivative of this new element at common sides of two triangles are not only continuous, but also identical with the quadrature values using the trapezoidal rule. The relationships of Specht’s element with Zienkiewicz’s incompatible cubic element, Argyris’ TRUNC II element, and the quasiconforming element are discussed.