All functions may have dependencies. Dependencies are information readers that have to be executed before another function can be executed since some kind of information or intermediate step is necessary. Dependencies can be added if another information reader, an option or a connection is added to the filetree. If you want to calculate for example the mean value, of one file, the count values information reader has to be executed first.
The dependencies for each function are listed under the specific function sections at the sections information reader functions, option file changer functions and connection functions.