Some FORS1 calibration data are presently monitored to extract information about their quality and the instrument performance. The quality information is extracted into so-called QC parameters.
FORS1 calibration data are pipeline-processed to create calibration products. The quality of the products is measured by QC1 parameters. Most QC1 parameters are obtained by pipeline procedures; some are measured by post-pipeline recipes.
All measured QC1 parameters are stored in a database. Their evolution with time is evaluated by the trending process.