Consideration is to be given to the principle that the benefits of updating must outweigh its costs, and to the principle that additional costs and burden remain within a reasonable limit.
Jāievēro princips, saskaņā ar kuru no atjaunināšanas gūtajam labumam jāatsver izdevumi, kā arī princips, saskaņā ar kuru papildu izdevumi un slogs nedrīkst pārsniegt samērīgu līmeni .