Software development is a craft driven by heuristics. The conditions for every project are different. It's difficult to identify contributing conditions. These

Software development is a craft driven by heuristics. The conditions for every project are different. It's difficult to identify contributing conditions. These conditions include technologies, abstraction, business factors, trends, development talent, talent of peers, market position, maturity of the market, funding, knowledge of current requirements, mutation of requirements, complexity of the requirements, interacting agents, etc. I can see why it would be so difficult to find correlations.