The piezoelectric patches have started to play an important role in continuous online health monitoring of structures in recent years because of their diminutive shape, cost effectiveness and easy installation process. The research for structural identification and force transfer phenomena has recently become an area of interest researchers working in PZT related structural health monitoring. The PZT patch allow the systems and structures to monitor their own structural integrity while in operation and throughout their life, and are useful not only to improve reliability but also to reduce maintenance and inspection cost of systems and structures specifically, in the electro-mechanical impedance (EMI) technique based SHM, the PZT patches are either embedded or bonded with adhesive to the host structure to be monitored. When bonded on the surface of the structure, the adhesive bond forms an interfacial layer of finite thickness between the patch and host structure. The performance (sensing/actuating) of piezo transducer depends upon the ability of the bond layer to transfer the stresses and strains between the active PZT patch and the host structures. The mechanical and geometrical properties of the adhesive bond layer change the overall performance of the PZT-structure interaction model. The main objective of this paper to review the shear lags models developed so far and discuss their effective applicability EMI technique.