The RedMonk chart measures language popularity by activity on GitHub and StackOverflow. Top business languages Cobol, Transact-SQL, and PL/SQL aren't included a

The RedMonk chart measures language popularity by activity on GitHub and StackOverflow. Top business languages Cobol, Transact-SQL, and PL/SQL aren't included at all in the 84 languages listed so the popularity measurement criteria is flawed. The Redmonk measurement also seems to be gamed because the second cluster in the chart includes some languages with backers who are heavily promoting the popularity of the language, including using Stack Overflow as their primary documentation effort and creating numerous shell projects on Github.