The paper first focuses on the historical context in which Reissner's famou
s shear deformation plate theory was derived. Here essentially Eric REISSNE
R's own view on this matter, in particular the relation to Mindlin's contri
bution, is followed [15]. The significance of shear deformable plate and sh
ell theories for the derivation of finite elements is briefly described. As
a major aspect it is shown how these formulations can be easily extended t
o a completely three-dimensional model allowing to apply unmodified 3D cons
titutive equations and to include large strain effects but keeping the esse
ntial features of a thin-walled structure. Finally, the importance of Reiss
ner's variational principle for the development of hybrid finite element mo
dels is pointed out.