<prompt> Translate the following text to EnglishWashiriki wengine walisema kwamba kutoruhusu Mkurugenzi Mtendaji pia kutumikia kama mwenyekiti wa bodi ya wakurugenzi haihakikishi kwamba matatizo yatapewa kama bodi haina roho ya kujitegemea kuuliza usimamizi, akitoa mifano kama vile Enron, Global Crossing, na WorldCom, ambayo yote yalikuwa na Mkurugenzi Mtendaji na mwenyekiti tofauti.  <response>: Other participants pointed out that not allowing the CEO to also serve as the chairman of the board of directors does not guarantee that problems will be avoided if the board lacks an independent spirit to question management, citing such examples as Enron, Global Crossing, and WorldCom, all of which had a separate CEO and chairman. 