[thesuperbigfrog]

It should be noted that this paper was released before the Ada 95, Ada 2005, Ada 2012, and soon-to-be Ada 2022 standards were published:

Ada 95: https://www.adahome.com/rm95/

Ada 2005: https://www.adaic.org/resources/add_content/standards/05rm/h...

Ada 2012: http://www.ada-auth.org/standards/12rm/html/RM-TTL.html

Ada 2022 (draft): http://www.ada-auth.org/standards/ada22.html

The paper's abstract states: "Although Ada supports concurrency and can thus be used as a concurrent programming language, it is not generally considered to be an object-oriented programming language."

Object-oriented programming was added in Ada 95, so this paper is probably not relevant to modern programming unless you are interested in the history of the Ada programming language.