**Exhibit 12.1**

**Advanstar Communications Inc.**

**Computation of Ratio of Earnings to Fixed Charges/Deficiency**

**In the Coverage of Fixed Charges by Earnings BeforeFixed Charges**
| ** **                                                                                       | ** ** | **December 31,** | ** ** |
|--------------------------------------------------------------------------------------------------|------------|-----------------------|------------|
| **(in thousands)**                                                                          | ** ** | **2006**              | ** ** | **2005** | ** ** | **2004** | ** ** | **2003** | ** ** | **2002** | ** ** |
| ** **                                                                                       | ** ** | **(unaudited)**       | ** ** | **(unaudited)** | ** ** |
| ** **                                                                                       | ** ** | ** **            | ** ** | ** ** | ** ** | **(As Adjusted)** | ** ** |
| Earnings before fixed  charges:                                                                  |       |                  |       |   |   |   |   |   |   |   |   |
|                                                                                             |       |                  |       |   |   |   |   |   |   |   |   |
| Loss from  continuing operations before income taxes and cumulative effect of accounting  change |       | $                     | (33,440    | ) | $ | (37,311 | ) | $ | (36,515 | ) | $ | (62,308 | ) | $ | (59,048 | ) |
| Portion of rents  representative of interest factor                                              |       | 2,366                 |       | 2,348 |   | 3,021 |   | 2,420 |   | 2,334 |   |
| Interest on  indebtedness                                                                        |       | 52,941                |       | 61,582 |   | 70,523 |   | 58,641 |   | 51,714 |   |
| Earnings (loss)  before fixed charges                                                            |       | $                     | 21,867     |   | $ | 26,619 |   | $ | 37,029 |   | $ | (1,247 | ) | $ | (5,000 | ) |
|                                                                                             |       |                  |       |   |   |   |   |   |   |   |   |
| Fixed charges:                                                                                   |       |                  |       |   |   |   |   |   |   |   |   |
|                                                                                             |       |                  |       |   |   |   |   |   |   |   |   |
| Portion of rents  representative of interest factor                                              |       | 2,366                 |       | 2,348 |   | 3,021 |   | 2,420 |   | 2,334 |   |
| Interest on  indebtedness                                                                        |       | 52,941                |       | 61,582 |   | 70,523 |   | 58,641 |   | 51,714 |   |
| Total fixed  charges                                                                             |       | $                     | 55,307     |   | $ | 63,930 |   | $ | 73,544 |   | $ | 61,061 |   | $ | 54,048 |   |
|                                                                                             |       |                  |       |   |   |   |   |   |   |   |   |
| Ratio of earnings to  fixed charges                                                              |       | —                |       | — |   | — |   | — |   | — |   |
|                                                                                             |       |                  |       |   |   |   |   |   |   |   |   |
| Deficiency in the coverage of fixed charges by earnings before fixed  charges                    |       | $                     | (33,440    | ) | $ | (37,311 | ) | $ | (36,515 | ) | $ | (62,308 | ) | $ | (59,048 | ) |

 

----