of each regular session. All three deal with standing internal issues of the workings of Parliament. Committee on public organisations, banks, public utility enterprises and social security agencies At the onset of each parliamentary term the speaker institutes the committee which operates for the entire duration of the parliamentary term, including the period between sessions. The committee gives its opinion on the suitability of nominations or renewal of terms in office for chairmen and managing directors serving at public enterprises, banking institutions, public utilities enterprises and social security agencies. The committee may invite anyone of the aforementioned individuals for a hearing six months after they have been appointed or a semester after they last appeared before it. Committees on matters of national significance or general interest Such committees are instituted by means of decisions Parliament makes upon the government's suggestion or following a proposal by the speaker of the parliament or the presidents of the parliamentary groups. The committees' task is to elaborate on issues of general importance or national significance. Upon deciding to establish such a committee, the parliament also determines its subject and the deadline for submitting a report on its findings. Investigation committees Investigation committees are established for the assessment of issues of general interest, following the proposal of one fifth of the total number of MPs (60 MPs) and the vote of the plenary session, which is determined by the absolute majority of the present MPs and cannot be smaller than two fifths of the total number of MPs (120 votes). If the issue relates to foreign affairs or national defense, the absolute majority of all MPs (151 votes) is required. Parliament decides on the deadline for the submission of the committees’ report. Investigation committees are vested with all the powers of the investigating authorities and the public prosecutor. Ad hoc committees Should parliament decide to opt for a preliminary investigation, a 12-member committee of MPs shall be appointed and a date shall be set to determine the deadline by which the committee should produce a written report on its findings. In the report all relevant evidence must be attached. Ad hoc preliminary committees are vested with all the powers of the public prosecutor when conducting a preliminary investigation. The committee's report on its findings must be reasoned and should contain a succinct proposal to open criminal proceedings. Committee for MP and political party auditing The