Edited sentence: Although Great Southern survived the reforms, another company, Australian Plantation Timber, was driven into administration.Tax law reforms in the late 1990s resulting from a major review of tax policy (called the Ralph review) altered the way in which deducations could be claimed.The tax-driven nature of investment in the sector made it vulnerable to policy changes and court rulings interpreting tax law.These changes, together with company profit warnings, caused a decline in Great Southern's share price and its business prospects in 2000 and 2001