Performance time metric
Using the default values when entering for seniors: The default values, however, shall be provided whenever possible, even if at the cost of flexibility. Also, in case of an error, elder users shall never be made to fill a form from the very beginning. Elder users spend more time inputting data and can’t always easily comprehend which data is obligatory and which is optional. Regular users benefit from defaults as well, but generally better quality of input information is favored.