You have difficulties to create Unit Tests? Many bugs appear when you change the base code? Well, it means probably there are problems of architecture in the software. To reduce this technical debt should be a priority. Well, but how to do? The SQALE Pyramid will help you to define priorities.
In this story, I introduce the SQALE Pyramid. This story is based on a post of the sqale.org website (http://sqale.org/the-sqale-pyramid-a-powerful-indicator).