A controversial statement that I challenge most organizations with is that the greatest causes of tuning issues in the environment are the ones which can be attributed to management. Management have to balance the business needs and determine the appropriate technology that should be used in an organization. This can be based on either key business objectives or the need to address the pain felt by users within the organization.
What is not well known is that a manager is responsible for the culture within the work environment. This includes ensuring a good rapport between the technology groups (or vendor) and that there is a free flow of information between the groups.
A manager, who has minimal to no technological training can easily fall prey to the latest trend or rumor being circulated about what is the best direction to follow. They might decide to switch the whole environment from Windows to Linux, because it has been seen to be cheaper. They might swap out hardware...