There's also a long-held sentiment that immigrants aren't particularly fruitful recruits for unions, as language barriers and cultural differences make such recruitment difficult.

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Headship recruitment was most difficult in London where 44% of jobs were re-advertised.

BBC: Schools 'struggling to recruit head teachers'

So you have to recruit somebody out of that group which is a difficult recruitment job, and we've had some successes but not enough.

BBC

This balancing act will only get more difficult now, as the Democratic takeover was fueled by the recruitment and election of more conservative Democrats around the country.

NPR: Profile: Nancy Pelosi, House Majority Leader

The accuracy of player evaluation and from a recruitment perspective the transferability of their skills into the Premier League is still really difficult because of the data that is available.

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