The development fiasco at Discovery Bay two decades ago could not happen under present town planning rules, Donald Tsang Yam-kuen said yesterday. The acting chief executive said he was not totally convinced that the Lands Department at the time should have sought the Executive Council's endorsement for changes to land use. The Lands Department has since been criticised for not getting Exco's approval when it changed the project from recreational to residential in the 1980s. Mr Tsang was addressing the Legislative Council in his capacity of chief secretary, in response to its criticism of the way the Discovery Bay development was handled. 'It's a matter of interpretation,' he said, referring to the lease conditions at the time. They vested the Lands Department with the legal clout to deal with changes, he said. Mr Tsang said town planning was now a more mature process, governed by clear and open statutory measures.