The research on how company management affects its success has shown mixed results. One reason for this is that the theories used don't always match the type of companies being studied. Some studies look at how ownership affects performance but include companies where owners have little control. Others look at how the board of directors affects performance but don't consider the theory that too much cash can lead to problems. Some studies don't use any theory at all, making their results hard to understand. To improve future research, it's important to use the right theories and avoid these mistakes.