Exhibit 21



Subsidiaries of the Registrant



The following are subsidiaries of the Registrant as of December 31, 2007 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 Caribe Operations LLC                                  |  | Puerto Rico                    
|CDI Marine Company (b)                                     |  | Florida                        
|C.D.I. Professional Services Group, S. de R.L. de C.V. (c) |  | Mexico                         
|CDI Professional Services, Ltd.                            |  | Canada                         
|CDI Orchard Financial Services Limited                     |  | Delaware                       
|Management Recruiters International, Inc. (d)              |  | Delaware                       
|Maplehill Corporation                                      |  | Delaware                       
|The M&T Company (b)                                        |  | 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 LLC                                             |  | Delaware                       
|Franchise Services of Ohio, Inc.                           |  | Delaware                       
|MRI Contract Staffing, Inc.                                |  | Ohio                           
|Subsidiaries of Brownshill LLC:                           
|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                         



|(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 Marine Company and The M & T Company also conduct their business using the trade names of CDI Government Services, CDI Business Solutions and CDI Engineering Solutions.
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|(c) |  | 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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|(d) |  | Management Recruiters International, Inc. also conducts its business using the trade names of MRI, MRINetwork, MRI Worldwide, Sales Consultants, Office Mates 5, and CompuSearch.
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