Excerpt from Productivity Impacts of Software Complexity and Developer Experience
The high costs of developing and maintaining software have become widely recognized as major obstacles to the continued successful use of information technology. For example, Barry Boehm has estimated that $140 billion is spent annually worldwide on software [boehm, Therefore, even a small increase in productivity would have significant cost reduction effects. However, despite the practical importance of software productivity, there is only a limited amount of research in measuring software development productivity and in understanding the effect of software complexity on variations in productivity.