This website has been developed to provide information and a registration platform for Phytoplankton analysts taking part in the annual International Phytoplankton Intercomparison (IPI) exercise. On this website you can register your interest in participation. You can also find information on the proficiency testing scheme, including the history of the exercise, the current programme of activities, publications and reports and links to our partners. We are currently working towards accreditation of this scheme as a Proficiency testing provider under ISO 17043 and ISO13528.