From what I’ve seen, the theology must be continuously reinterpreted as society changes, and so there’s always a lot of room for differences.
This is a great explanation of development of doctrine, a Catholic concept to be sure.
However, it does not mean that doctrine changes.
Take this analogy:
It has been the “constant teaching” in our house that when the girls come home from school they are to do certain things: put their school supplies away, put their shoes away, wash their hands, take off their uniforms, eat their snack, finish their chores, practice their piano, etc etc etc.
Despite the fact that they have been doing this every school day for 3-13 years every once in a while we need to have a “family meeting” to pronounce, declare and define exactly who should be doing which job and how it is to be done. (Note: I try to ignore their incredulous looks that say, “What? We’re supposed to hang up our backpacks again this year?” or “What? You’ve never said that we had to take off our uniforms *and *hang them up!” )
At this council we recall what’s been done in the past, review the current norms and define again exactly what’s the expectation. Sometimes the kids complain that we are “reinterpreting the rules”, claiming we’ve “never done it this way before” when in actuality we are just pronouncing, declaring and defining a standard norm of our family.
And an example of “development of doctrine”: initially, none of the girls had backpacks. However, at about the 3rd grade it became necessary to declare, “All backpacks must be hung up before eating your snack!”.
Now, was this a new rule that we just made up? Or was it simply an application of the rule: all school supplies musts be put away?
For the first 4 years of schooling it wasn’t necessary to address backpacks. However, as the need developed, we made the necessary applications.