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This paper presents an efficiency of various non-conforming (NC) modes in development ofa series of new finite elements with the special emphasis on 4-node quadrilateral elements. The NCmodes have been used as a key scheme to improve the behaviors of various types of new finite elements,i.e., Mindlin plate bending elements, membrane elements with drilling degrees of fredom, flat shelelements. The NC modes are classified into three groups according to the correction constantsof irectModification Method. The first group is asic NC modes, which have been widely used by a numberof researchers in the finite element communities. The basic NC modes are effective to improve thebehaviors of regular shaped elements. The second group is ierarchical NC modes which improve thebehaviors of distorted elements effectively. The last group is igher order NC modes which improve thebehaviors of plate-bending elements. When the basic NC modes are combined with hierarchical or higherorder NC modes, the elements become insensitive to mesh distortions. When the membrane component ofa flat shell has hierarchical NC modes the membrane locking can be suppressed. A number ofnumerical tests are carried out to show the positive effect of aforementioned various NC modesincorporated into various types of finite elements.