Ministers may be designated by the Prime Minister to be in charge of particular ministries, or as Ministers in the Prime Minister's Office. Such Ministers were formerly known as Ministers without portfolio. The Prime Minister may retain any department or subject in his charge. Some Ministers are appointed as Second Ministers for portfolios other than their own to assist the primary Minister in his or her duties. For instance, on 1 April 2009 during the 11th Parliament, Lim Hwee Hua, who was a Minister in the Prime Minister's Office, also held the posts of Second Minister for Finance and Second Minister for Transport.