​A specification that has been formally reviewed and agreed upon, that thereafter serves as the basis for further development or change and that can be changed only through formal change control procedures or a type of procedure such as configuration management.​​

Reference: Sub working groups Architecture, Services Catalogue LCRDM (Architecture entities) 
Source: TOGAF 9.1 http://pubs.opengroup.org/architecture/togaf9-doc/arch/​ 
0.1 7/6/17​​

Alternatieven en discussie hieronder: