| Abstract | .... 2 | |
| 1 | Introduction | .... 2 |
| 2 | Description of Qupras | .... 5 |
| 3 | Hierarchy of variables based time of transition | .... 6 |
| 4 | Hierarchical Contorol of Qualitative Reasoning | .... 7 |
| 4.1 | Analysis of transitions within each hierarchy | .... 7 |
| 4.2 | Communucation of Information across Hierarchies | .... 7 |
| 4.3 | Algorithm | .... 9 |
| 5 | Example | .... 10 |
| 6 | Discussion | .... 13 |
| 7 | Conclusion | .... 14 |
| Acknowledgements | .... 15 | |
| Reference | .... 15 | |
| End | .... 16 |
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