software development concepts
It takes discipline for development teams to benefit from modern software engineering conventions. If your team doesn't have the right kind of engineering discipline, the tools and processes you use are almost irrelevant. I advocated as much in Discipline Makes Strong Developers.
But some commenters were understandably apprehensive
programming languages
As McConnell notes in Code Complete:
If you haven’t spent at least a month working on the same program – working 16 hours a day, dreaming about it during the remaining 8 hours of restless sleep, working several nights straight through truing to eliminate that “one last bug” from the