Classical management theory based on the writings Weber, Fayola, Urwick, Gullick and Frederick W. Taylor was introduced in the early twentieth century to improve the effectiveness and efficiency of both business administration and public management. Rigid application of these theories were shown by the human relations school of the Hawthorne Studies, the research, Chris Argyris and Warren Bennis to have dysfunctional consequences for productivity, and job satisfaction. Briefly describe the key ideas of these two schools and assess whether these ideas are still useful ways to organize and manage public sector organization. Discuss whether new theories of public management are needed to build greater flexibility and entrepreneurial spirit into public sector organizations that give managers greater independence to manage their units in a decentralized and environmentally responsive way.