Why this matters
The urge to abbreviate often masks a naming problem that is actually a design problem. When you find yourself writing UsrAcctMgr instead of a full name, it usually means the class is doing too many things — a good name is being sacrificed because the concept is too complex to name well. Expanding the abbreviation forces you to confront that complexity, which often leads to splitting the class into smaller, clearly-named pieces.
Code Challenge
Study the messy code, try to refactor it, then reveal the clean version.
Key takeaway
If you can't name something without abbreviating, the thing itself is too complex — split it, then name each part clearly. The abbreviation is a symptom; too many responsibilities is the disease.