Enterprise Architecture: 20 year retrospective and links with SOA

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IASA is the "International Association of Software Architects" and "Perpectives of the IASA" is their periodical newsletter.

The April issue is entirely devoted to a retrospective on EA (20 years ago John Zachman published a first paper on EA) and also explains the links between EA and SOA.

Defintively worth a read: https://www.iasahome.org/web/home/perspectives