### Question
How does the law define modular system interface?


### Answer
Under *10 U.S.C. § 2446a*, **modular system interface** is defined as:

> a shared boundary between major systems, major system components, or modular systems, defined by various physical, logical, and functional characteristics, such as electrical, mechanical, fluidic, optical, radio frequency, data, networking, or software elements

#### Citation:
  - *10 U.S.C. § 2446a*
  - Heading: **Subtitle A-General Military Law > PART IV-SERVICE, SUPPLY, AND PROCUREMENT > CHAPTER 144B-WEAPON SYSTEMS DEVELOPMENT AND RELATED MATTERS > SUBCHAPTER I-MODULAR OPEN SYSTEM APPROACH IN DEVELOPMENT OF WEAPON SYSTEMS**

