(6)Substantial changes in the data used for the determination of the technical information on the relevant risk-free interest rate term structures may lead to a situation where data sources that were used in the past are no longer available. Furthermore, improved data availability may render obsolete the techniques used for the determination of the technical information on the relevant risk-free interest rate term structures. A substantial change in market conditions may also necessitate a re-assessment of parameters, including the ultimate forward rate, the starting point for the extrapolation of risk-free interest rates or the convergence period to the ultimate forward rate. Conditions should therefore be laid down to assess whether potential changes to data and techniques used for the determination of the technical information on the relevant risk-free interest rate term structure are commensurate with the objectives of transparency, prudence, reliability and consistency of the methods to determine the technical information on the relevant risk-free rate term structure over time. To this end, EIOPA should submit to the Commission an assessment of the impact of modified techniques, data specifications or parameters and the proportionality of the modification with respect to the substantial change in the data.