The critical contenders in the strategy consulting market are The Boston Consulting Group ( US ), Accenture ( Europe ), Roland Berger LLC ( Germany ), PwC ( UK ), McKinsey & Company ( US ), A . T . Kearney ( US ), Marsh & McLennan Companies Inc . ( US ), Deloitte Touche Tohmatsu Limited ( UK ), CGI Group Inc ( Canada ), Bain & Company ( US ), and Booz Allen Hamilton Inc . ( US ).