Everton boss Roberto Martinez feels the jury is out on whether Ole Gunnar Solskjaer will turn out to be the right man to lead Cardiff out of danger.
Solskjaer replaced Malky Mackay in January with the Bluebirds just a point above the bottom three but they head to Goodison Park this weekend inside the relegation zone, albeit on goal difference.
"It is difficult. It is very rare you get a real improvement for the long-term," he said.
"In the short term they sometimes get a positive reaction but a change rarely affects things in a good way for the long term.
"Sometimes we get those decisions. Overall you don't want to see those sort of changes and I personally don't believe the quick turnaround of a manager will give you long-term success unless you appoint the right man.
"It depends on every situation and every club has internal issues that they (should) know whether the decision will be right.
"But if you ask me nothing gives you more success in the long term than good stability and working with a real strategy to improve."
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