One take on this question could be "m_" vs "_". Either is good as they distinguish the scope/lifetime at a glance. Some people express a loathing for "m_", as its old hat. C++ & vb6 typically used some m_ or mvar or similar prefix. I was happy with that. Why change it? The point that many raised is either prefix is fine, so long as its consistent? So why oh why did it have to change?