The purpose of the Deep Ocean Observing Strategy (DOOS) is to improve understanding of the state of the deep ocean with respect to baseline conditions, response to climate variability and response to human disturbance. DOOS will identify approaches to address key scientific questions and societal needs, design and evaluate appropriate observing systems, pilot projects, and process studies. The evaluation of observing systems and data will follow the accepted principles outlined in the Framework for Ocean Observing and Global Climate Observing System monitoring principles. DOOS will work within the Framework for Ocean Observing developed by the Global Ocean Observing System (GOOS) and use this as a reporting mechanism to other relevant coordination mechanisms.