By common consent, the Edinburgh Festival Fringe can be counted a success. Ticket sales are up 20% on 2007, the previous record year. Anyone can put on a show at what is recognised as the world's biggest arts festival, provided they have the venue and the funding. Its purity as an arts festival (it is not funded and most performers participate not expecting to make a profit but focus on securing good reviews and a reputation) and the element of anarchy (as it is not curated, no-one is in overall charge) are two of the Fringe's defining characteristics.

But is it sustainable in its present shape and size? Michael Russell, the Scottish Culture Minister, has become the latest figure in the arts world to turn the spotlight on the Fringe. He tells The Herald today that the Fringe needs to examine whether the event has become too big, whether the programme is too large, whether cost has become prohibitive when staging a show, and what part promoters and producers play (and should play). His intervention comes after Tomek Borkowy, a leading Fringe producer, warned the Fringe Society, which runs the event, that it needed to modernise or face the prospect of a split.

According to Mr Borkowy, schism will be the outcome unless the Fringe is treated by the society as mainly market-led, performing arts trade fair.

Mr Russell has steered clear of warnings or a big stick approach. He would, perhaps, have a case to do so if the Scottish Government were strong on state intervention, backed by funding beyond the Expo schemes. Fortunately, Mr Russell favours a "light touch" approach, befitting the government's limited involvement. As Culture Minister, it is right that he asks the questions he poses. The Fringe should be prepared to face up to the questions about its future. It is a mark of any confident, successful organisation that it can stand back and have a good look at itself.

The Fringe should be no different. Care must be taken to ensure that the end product of any substantive review secures an event that is strengthened and keeps its vitality.