Before revision: In 2007, he Technology Roadmap for Productive Nanosystems defined "productive nanosystems " as functional nanoscale systems that make atomically-specified structures and devices under programmatic control, i.e., they perform atomically precise manufacturing.
After revision: In 2007, productive nanosystems were defined as functional nanoscale systems that make atomically-specified structures and devices under programmatic control, i.e., performing atomically precise manufacturing.