Overall, what benefits does NIEM hold for law enforcement and users at all levels of government?

"NIEM provides a standardize set of reusable data components and XML representation for enabling interoperable information sharing for law enforcement at all levels of government.  These components, a well-defined architectural framework, and set of tools provide for the consistent and efficient implementation of information exchange specifications.  Additionally, the NIEM program and governance structures provide a consensus framework for participation of stakeholders at all levels of government which is essential in the identification of requirements and harmonization of components to support the information sharing mission."