Exhibit 12.1

Advanstar Communications Inc.

Computation of Ratio of Earnings to Fixed Charges/Deficiency
In the Coverage of Fixed Charges by Earnings Before Fixed Charges

|                                                                             |                                                                 |                                      |     | Advanstar |       
|---------------------------------------------------------------------------- | --------------------------------------------------------------- | ------------------------------------ | --- | --------- | ------
|
|
|
|
|
|
|Earnings before fixed charges:                                               |                                                                 |                                      |     |           |       
|                                                                             | Income (loss) from continuing operations                        |                                      |     |           |       
|                                                                             | before income taxes, and cumulative effect of accounting change |                                      | $   | 7,660     |       
|                                                                             | Portion of rents representative of interest factor              |                                      |     | 1,821     |       
|                                                                             | Interest on indebtedness                                        |                                      |     | 37,923    |       
|                                                                             |                                                                 |                                      |     |           |       
|                                                                             |                                                                 | Earnings (loss) before fixed charges |     |           | 47,404
|                                                                             |                                                                 |                                      |     |           |       
|Fixed charges:                                                               |                                                                 |                                      |     |           |       
|                                                                             | Portion of rents representative of interest factor              |                                      |     | 1,821     |       
|                                                                             | Interest on indebtedness                                        |                                      |     | 37,923    |       
|                                                                             |                                                                 |                                      |     |           |       
|                                                                             |                                                                 | Total fixed charges                  |     |           | 39,744
|                                                                             |                                                                 |                                      |     |           |       
|Ratio of earnings to fixed charges                                           |                                                                 |                                      | 1.2 |           |       
|                                                                             |                                                                 |                                      |     |           |       
|Deficiency in the coverage of fixed charges by earnings before fixed charges |                                                                 |                                      |    |           | $     
|                                                                             |                                                                 |                                      |     |           |       

---