For instance, change of the underlying database from SQLite to MySQL would be reduced to one minute needed to modify four settings in the configuration file, if the application has been developed using CodeIgniter from the beginning, thanks to CodeIgniter’s Active Record Class (not counting time spent on programming the database, since that time is identical for both methods). On the other hand, the same change in the version written without using framework (performed later, solely for the purposes of this paper) took two hours of developer’s time.