This document discusses non-performing assets (NPAs) in banks. It classifies NPAs into sub-standard, doubtful, and loss categories, with different provisioning requirements for each. It then outlines various internal and external factors that can lead to NPAs. The document also discusses strategies banks use to control and manage NPAs, including preventive measures like monitoring and curative measures like debt restructuring, loan settlements, and using legal tools like the SARFAESI Act to recover assets.