Confusion is n't completely resolved however ; if Mr McGuinness writes to the Assembly committee , his note will have a letterhead that comes from the Office of the First Minister and Deputy First Minister , but he 'll get a reply back from the Committee for the Office of the First Minister and deputy First Minister . Confusion is n't completely resolved however ; if McGuinness writes to the Assembly committee that scrutinises his work , his note will have a letterhead that comes from the Office of the First Minister and Deputy First Minister , but he 'll get a reply back from the Committee for the Office of the First Minister and deputy First Minister .