This document discusses a study on reliability in MEMS (Micro Electro Mechanical Systems). It first provides an introduction to MEMS, describing their size and key fabrication processes like deposition, lithography, and etching. It then discusses two main MEMS fabrication techniques - bulk micromachining and surface micromachining. The document outlines several failure mechanisms in MEMS like mechanical fracture, corrosion, stiction, and wear. It concludes by stating that understanding the underlying physics of MEMS fabrication processes is key to overcoming mechanical and electrical failures.