[xor1]

>What if people have different perspectives even after knowing the person in the same capacity? What about what the person is biologically dispositioned towards? What about mental illnesses.

I would include all of these things under my definition of "personality".

>I would argue that people are changing their actions, not their personality.

Yes, you're right. I'm thinking purely in terms of internalized thoughts and externalized actions. Going from "I want to do X but I will be punished for it even though it's my first inclination, so I will do Y instead", to no longer thinking of X at all and your first inclination is Y (the "right") thing. To me, your internalized thoughts and the decision-making behind your actions are part of your personality.

The realized actions that actually occur are separate from that. Changing your personality means removing branches from your internalized decision-making that would have existed previously, so they're no longer considerations.