Another form of review of public procurement is through powers granted to the legislative arm of the state (Congress, Parliament, Bundestag, or Knesset). In almost every country in the world, the elected body has its own procurement oversight committee. It supervises the expenditures of the executive branch and makes sure that they conform to the budget. The difference between such supervisory, parliamentary, bodies and their executive branch counterparts - is that they feel free to criticize public procurement not only in the context of its adherence to budget constraints or its cleanliness - but also in a political context. In other words, these committees do not limit themselves to asking HOW - but also engage in asking WHY. Why this specific expense in this given time and location - and not that expense, somewhere else or some other time. These elected bodies feel at liberty - and often do - intervene in the very decision making process and in the order of priorities. They have the propensity to alter both quite often. The most famous such committee is, arguably, the Congressional Budget Office (CBO). It is famous because it is non-partisan and technocratic in nature. It is really made of experts, which staff its offices. Its apparent - and real - neutrality makes its judgements and recommendations a commandment not to be avoided and, almost universally, to be obeyed. The CBO operates for and on behalf of the American Congress and is, really, the research arm of that venerable parliament. In parallel, the executive part of the American system - the Administration - has its own guard against waste and worse: the Office of Management and Budget (OMB). Both bodies produce learned, thickset, analyses, reports, criticism, opinions and recommendations. Despite quite a prodigious annual output of verbiage - they are so highly regarded, that virtually anything that they say (or write) is minutely analysed and implemented to the last letter with an air of awe. Only a few other parliaments have committees that carry such weight. The Israeli Knesset has the extremely powerful Finance Committee, which is in charge of all matters financial, from appropriations to procurement. Another parliament renowned for its tight scrutiny is the French Parliament - though it retains very few real powers. But not all countries chose the option of legislative supervision. Some of them relegated parts or all of these functions to the executive arm.