| Answer | Crossword Clue |
|---|---|
| theories | A set of principles on which the practice of an activity is based |
| bedrocks | The fundamental principles on which something is based |
| systems | A set of principles or procedures according to which something is done; an organized scheme or method |
| cornerstone | An important quality or feature on which a particular thing depends or is based |
| cornerstones | An important quality or feature on which a particular thing depends or is based |
| LATOSCA | 1887 Victorien Sardou play on which an opera is based |
