What is the advised way to call a function from another controller?

In most of my controllers I have a __formData() function which creates
any arrays for select lists, radio buttons, check-boxes etc. I can
then call this from the add() and edit() actions and save some lines
of code etc.

However I would also like to call this function from another
controller when I am displaying a form which manages data across
multiple models. I believe I could use requestAction(), but the
CookBook states "It is rarely appropriate to use in a controller or
model" so how do I go about this in the most efficient manner?

Thanks,

Paul.
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