Recognizing the value of an advanced metering infrastructure (AMI), utilities worldwide are deploying millions of smart meters. To better justify AMI investment, researchers have recognized the urgency of utilizing the full potential of AMI to improve the quality of distribution management system (DMS) applications. However, the integration of AMI and DMS is a challenge as it entails different communication protocols and requirements for handling various meter information models. In addition, the AMI meter data load generated by millions of smart meters can potentially overwhelm DMSs. In this chapter, we first briefly review the state of the art of AMI technologies and then propose a unified AMI and DMS integration solution that easily adapts DMS systems to various AMI systems with minimal engineering effort.