The head of the International Monetary Fund says the world needs to prepare for the next economic crisis, even as it begins to recover from the worst recession since the Great Depression. IMF Managing Director Dominique Strauss-Kahn, speaking to business students at a Johannesburg university Tuesday, expressed concern that recovery could mean leaders will feel less pressure to pursue such reforms as tightening regulation and supervision of financial markets.Strauss-Kahn says he cannot not predict the timing or the nature of the next crisis, but that he is sure it will come. Strauss-Kahn is on an African tour that started in Kenya and will take him to Zambia from South Africa.