(Image: ABC iView)

Three of the ABC's highest-profile broadcasting jobs are soon to be vacant, and filling them will be the first big test for new chair Ita Buttrose and the yet-to-be named managing director.

Barrie Cassidy, founding host of Insiders, announced last week that he will retire after the federal election in May; founding Q&A host Tony Jones will leave his program at the end of the year; and ABC Melbourne radio mornings presenter Jon Faine has also announced his retirement.