Change (in the ai4k.eu context) is a small modification to the existing website. A small modification in the header text, footer color, or in any section for example is a Change. Creating a new header, footer or an adding a new section is not a Change, and it should be quoted using Professional Time.
Adding new programs (not included in our add-on line-up) will be quoted by Professional Time, and not by using the Changes included in your plan. Functionality may not be guaranteed.