A few of Fowler’s Smells.
| Poor Names | Name suggests wrong intent |
| Long methods | More than 1 thing/multiple levels of abstraction |
| Large classes | More than one concept/multiple levels of abstraction |
| Long parameter list | Too many arguments to keep straight (> 3) |
| Duplicated code | Same or similar code appears in more than one place |
| Divergent change | The class/method changes for dissimilar reasons |
| Shotgun Surgery | Single change affects multiple classes/methods |
| Feature Envy | One class uses another class¿ members |
| Switch Statements | Duplicated switches/if-else’s over same criterion |
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