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.