코드에 나쁜 CodeSmell이 느껴진다면 [[Refactoring]]해야한다.

 * Duplicated code
 * Long method
 * Large class
 * Long parameter list
 * Divergent change
 * Shotgun Surgery
 * Feature envy
 * Primitive obsession
 * Switch statements
 * Parallel inheritance hierarchies
 * Lazy class
 * Speculative generality
 * Temporary field
 * Message chains
 * Middle man
 * Inappropriate intimacy
 * Alternative classes with different interface
 * Incomplete library class
 * Data class
 * Refused bequest
 * Comments

SeeAlso
 * Wiki:CodeSmell
 * Xper:CodeSmell