How do you calculate a maintenance cost and what kind of actions you include as maintenance?
I've seen some companies which charges a month fee for using the program + any change or modification required. 40$/hour.
Other companies don't charge a monthly fee, they charge only when a change is requested.
And there is who charges a fixed monthly fee whch covers any change requested
(with a maxinum of monthly hours...)
What is your experience with this situation? Which maintenance policy works better for both parts?