4.55. Confidence in the assessment results will be enhanced if the site characterization and safety assessment programmes are of high quality; if site data collected by the operator are consistent with other existing data in terms of parameter values and the measurement methodology applied; if the safety assessment models developed are consistent with the properties of the site and the conceptual understanding of the site based on scientific principles; and if the conceptual understanding of the site and the safety assessment models continue to be compatible with and appropriate for any new information about the site that may become available, subject to only minor refinement.