1. The deviser often cares the reflection range of the structure when some parameters vary in certain scope, in order to assure its carrying capacity.

2. So the deviser can modify the link relation to save time to search the target page.

3. The deviser often cares about when some parameters vary in certain scope, the reflection range of the structure need to be known in order to assure its carrying capacity.

4. It provides a sort of design means with high efficiency and facility for a deviser.

5. Vilter was grown up in this period and became an important deviser and practitioner of economic reform in the end of the reign of czar.

6. After validating a lot of the experimental data, the system provide the optimize adding direction to the user through the experienced formula in order to achieve the original intention of the deviser.

7. The system consists of 6 grade I indexes and 20 grade II indexes as policy management, surroundings risk, owner risk, deviser risk, supervisor risk and contractor risk.