The workshop is open to all and very much welcomes participants who are not members of the Herschel instrument calibration teams who have found Herschel calibration issues and/or have developed their own capabilities for calibration and data analysis. It particularly welcomes experts involved in calibration of other observatories to investigate further lessons we can learn as the Herschel mission moves into the post operations phase. Herschel instrument experts will also attend the workshop to provide their assessment of the overall calibration and cross-calibration and future calibration improvement prospects.