(20)In particular, this Directive should not be too burdensome for insurance undertakings that specialise in providing specific types of insurance or services to specific customer segments, and it should recognise that specialising in this way can be a valuable tool for efficiently and effectively managing risk. In order to achieve that objective, as well as the proper application of the proportionality principle, provision should also be made specifically to allow undertakings to use their own data to calibrate the parameters in the underwriting risk modules of the standard formula of the Solvency Capital Requirement.