Let's use an example to illustrate how to add a field in the model. I want to add a melting rate field to the calving parameters. This melting rate is given by the user so we add the field to the GUI interface. 

== Modify the GUI ==

Go to `src/m/classes`

{{{
#!sh
cd $ISSM_DIR/src/c/shared/Enum/
./Synchronize.sh
}}}