Exhibit 21



Subsidiaries of the Registrant



The following are subsidiaries of the Registrant as of December 31, 2006 and the jurisdiction in
which each is organized. Each of the subsidiaries generally conducts its business using the names indicated except as separately set forth herein. Certain subsidiaries are not listed. These omitted subsidiaries individually and in the aggregate do
not constitute a significant subsidiary.



|                                                           |  |                                
|---------------------------------------------------------- |  | -------------------------------
|Subsidiary                                                 |  | State or Country ofOrganization
|Subsidiary of the Registrant:                             
|CDI Corporation (a)                                        |  | Pennsylvania                   
|Subsidiaries of CDI Corporation:                           |  |                                
|CDI AndersElite Limited                                    |  | United Kingdom                 
|CDI Engineering Solutions, Inc. (b)                        |  | Delaware                       
|CDI Marine Company (c)                                     |  | Florida                        
|C.D.I. Professional Services Group, S. de R.L. de C.V. (d) |  | Mexico                         
|CDI Professional Services, Ltd.                            |  | Canada                         
|CDI Orchard Financial Services Limited                     |  | Delaware                       
|Liquid Medium, LLC                                         |  | Delaware                       
|Management Recruiters International, Inc. (e)              |  | Delaware                       
|Maplehill Corporation                                      |  | Delaware                       
|Shared Services of West Virginia LLC                       |  | Delaware                       
|The M&T Company (c)                                        |  | Pennsylvania                   
|Todays Staffing, Inc. (f)                                  |  | Pennsylvania                   
|                                                           | 
|Subsidiaries of CDI AndersElite Limited:                   |  |                                
|CDI AndersElite Australia Pty Limited                      |  | Australia                      
|Worldwide Contract Recruitment Limited                     |  | United Kingdom                 
|                                                           | 
|Subsidiaries of Management Recruiters International, Inc.: |  |                                
|Brownshill Corporation                                     |  | Delaware                       
|Franchise Services of Ohio, Inc.                           |  | Delaware                       
|MRI Contract Staffing, Inc.                                |  | Ohio                           
|Subsidiary of Brownshill Corporation:                      |  |                                
|Brownshill Holdings Limited                                |  | United Kingdom                 
|Browns Canyon Corporation                                  |  | Delaware                       
|Subsidiary of Brownshill Holdings Limited:                 |  |                                
|MRIWW Franchise Services Ltd.                              |  | United Kingdom                 
|Subsidiary of Maplehill Corporation:                       |  |                                
|Asset Computer Personnel Corporation                       |  | Canada                         
|Subsidiaries of Todays Staffing, Inc.:                     |  |                                
|Todays Staffing, Ltd.                                      |  | Canada                         
|Yellowhill Corporation                                     |  | Delaware                       
|Subsidiaries of Yellowhill Corporation                     |  |                                
|Yellow Canyon Corporation                                  |  | Delaware                       
|Subsidiaries of Shared Services of West Virginia LLC:      |  |                                
|Greenhill LLC                                              |  | Delaware                       
|Subsidiary of Greenhill LLC:                               |  |                                
|Green Canyon LLC                                           |  | Delaware                       



|(a) |  | CDI Corporation also conducts its business using the trade names of CDI Business Solutions, CDI Engineering Solutions, CDI-Aerospace, CDI-Government Services, CDI-IT Solutions, CDI-IT
Services, CDI-Life Sciences, and CDI-Process & Industrial.
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|(b) |  | CDI Engineering Solutions, Inc. also conducts its business using the trade names of CDI Business Solutions, CDI-Life Sciences, and CDI-Process & Industrial. Effective
December 31, 2006, CDI Engineering Solutions, Inc. was merged into CDI Corporation.
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|(c) |  | CDI Marine and The M & T Company also conduct their business using the trade names of CDI Business Solutions and CDI Government Services.
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|(d) |  | C.D.I. Professional Services Group, S. de R.L. de C.V. also conducts its business using the trade name of CDI.
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|(e) |  | Management Recruiters International, Inc. also conducts its business using the trade names of MRI, MRI Worldwide, Sales Consultants, Office Mates 5, and CompuSearch.
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|(f) |  | Todays Staffing, Inc. also conducts its business using the trade names Todays Legal Staffing, Todays Office Staffing and Todays Financial Staffing.
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