Management theory was for long dominated by Causation, (just think about Kotler, in other words Planning, Implementing and follow up.) a different theory that has gained momentum in the last years ( Even if it was first launched in 2001 by Saras D Sarasvathy) is the theory of effectuation that is means driven instead of ends driven. I studied those theories quite extensively but found that when it comes to effectuation there is still no consensus, in other words the theory is not yet mature, something that is in my view a bit odd since the theory is 20 years old just about. Why do you think it has taken such a long time for this theory to mature? my second question. What is the relevance of Kotlers Marketing Management today? Still relevant or? Your thoughts?