1. Establish a network to measure environmental change in marine waters by undertaking long-term research and monitoring 2. Maintain and enhance existing long-term research programmes 3. Restart important discontinued long-term research programmes 4. Develop a quality controlled database of long-term marine data series 5. Deliver and interpret long-term and broad scale contextual information to inform water quality monitoring 6. Demonstrate the benefits of preserving and networking long-term time series programmes