NDAA Category 

Type - Term
Description: The NDAA defines three transition categories as follows: 1. New - New systems expected to be needed to complete the DoD Business Enterprise Architecture 2. Legacy - Defense business systems as of December 2, 2002 (known as legacy systems), that will not be part of the objective DoD Business Enterprise Architecture 3. Modify - Defense business legacy systems that will be a part of the objective Defense business system by making modifications to those systems to ensure that they comply with the DoD Business Enterprise Architecture. Unknown - DoD business legacy systems for which a transition strategy has not been determined (Category of Unknown not defined in the NDAA). 
Acronym: NDAA
 
Comments: Enterprise Transition Plan Glossary