To use the IRB as a specific example, it runs a very rigorous selection process for positions. The intent to run a process is announced publically. People apply, and then they go through a very rigorous selection process to arrive at a list of qualified candidates. That is then submitted to the minister to select those to recommend as appointees to cabinet. The IRB is a good example of a very rigorous, open, and transparent selection process for the members of that board.
The government has announced its commitment to run such open and transparent processes for as many appointments as possible. Positions as heads of agencies, for example, are announced. There's a government website that lists the vacancies, and people can apply for them. Selection processes are run to identify qualified candidates. At the end of the day, the responsible minister makes a recommendation to cabinet. The IRB is a good example.