Thomson.com/learning and Prometric( previously Sylvan Technology )

Can somebody tell me the relation between www.thomson.com/learning and Prometric( previously under the name of Sylvan examination centres) ?

Parent company and subsidiary ?

Thanks

 

From A Part of the Thomson Corporation:

"In March, 2000 The Thomson Corporation acquired Prometric with a focus on strengthening learning outcomes through testing and assessment. Prometric quickly became an important component of the Thomson Learning market offering: ..."