I don't have any problem with multiple articles targeting the same keyword on one website as long as they are extremely different and they also target different secondary keywords. If competition is thin you might be able to get #1, #2, #3, #4 for that keyword in google with multiple pages targeting the same keyword. I have that for the main money keyword for one of my sites. I have another site that has a dozen #1, #2, #3 rankings and scores of #1 and #2.
Before I produce a second article for any topic, I make sure that my first article is comprehensive, substantive, well illustrated, kickass and no less than the best on the web for that topic.
If I purchased or inherited a site with many articles targeting the same keyword then I would try to combine a few of them into the best comprehensive article about the topic.
If I was advising a company that produces some kind of software who has all of this duplication, I would tell them to start creating "how to do it".... "how to understand it"... practical stuff content that helps people use your software and shows how your software is better than the competition.
I would be publishing the reference book for accounting in that industry. Each industry has its own accounting situations. I would have the Bible of Dairy Queen (or whatever) accounting published on my website and everybody everywhere in that industry would be talkin' about my site and referring their bosses, employees, and other staff to my website where they can find everything anybody ever asked about Dairy Queen accounting.
Why Dairy Queen? answer here... And after you have read that, you will understand why accounting Bibles are needed for each industry.
