Graham Potter has improved teams and players at every club he has managed; the problem is, it has taken time to deliver change and results.
And that may be the biggest challenge facing the former Brighton boss when he takes charge of Chelsea following the dramatic sacking of Thomas Tuchel.
Chelsea are not known for their patience, where managers are concerned.
The club's appetite for success under Roman Abramovich was so great that the Russian owner chomped through 13 different men across 15 managerial spells from 2003, and between them were allowed to gobble up £2billion in transfer fees.