Prime ministers also appoint cabinet committees to develop and implement specific policy. This can be an effective way of enhancing prime ministerial authority, since the prime minister determines the membership and the number and remit of the committees. The decisions of cabinet committees possess the same legitimacy as decisions of the full cabinet. The prime minister often chooses to chair committees on issues that are particularly important to the government. For example, Boris Johnson decided to chair the Covid-19 Strategy Committee and the Climate Action Strategy Committee.