It is very interesting that you have taken up this task.

I read your article and have a gripe, in-as-much-as you use the term "Fourth Generation Language".
(e.g. "Several Fourth Generation Language products (Powerhouse, Transact, Speedware, Protos) became available from third party vendors".)

I am aware of Machine Code (First Generation) which is executable.
I am aware of Assembler languages (Second Generation) which convert Assembler code into Machine Code for execution. 
I am aware of Compiler languages (Third Generation) which convert directly into Machine Code for execution.

I have always challenged the term "Fourth Generation Language" because I am aware of none.

There are 'products' (such as Powerhouse, Speedware, etc.) which make the claim to be a "4GL" but never has anyone given me a name, or explained to me what "Fourth Generation Language" the product is using, and where I can study this so-called language.

There is a major difference between a product and a language.

The Marketing Department at these companies have done such a stellar job that their 'jingle' seems to have remained, and now is ensconced in Wikipedia via your article.

So will you name names and provide the names of the languages referred in your use of the term "Fourth Generation Language"?

Kindest Regards,
Tom.

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