The PM should be able to appoint cabinet ministers they trust to run departments of Parliaments that are responsible for. If the PM cannot trust most of their cabinet, Parliament would be much less efficient
David Cameron appointed Nick Clegg to be the deputy prime minister in 2010 in order to secure the coalition support he needed for a majority
Collective responsibility means that it may be beneficial to appoint some opposing ministers in the cabinet as they cannot always speak out when they want to without consequence
Rishi Sunak appointed Suella Braverman to his cabinet in order to manage her but she was later sacked due to her article in the Times
Theresa May appointed Boris Johnson to prevent him from being rebellious as he wasn't as disciplined as she hoped when he was on the backbenches
The PM chairs cabinet meetings and controls what information is presented. They can keep cabinet in line by threatening them with a reshuffle but also promote those who share their own views. It can backfire as they may be seen as incompetent or ministers can refuse to change posts
