a) Administrative problems are mainly practical and technical. Most problems of government, of business and social welfare, are technical. The investigations, i.e., social surveys, made in different parts of the country by the Bureau of Municipal Research of New York City, are studies of local administration made primarily for the purpose of improving the efficiency of an existing administrative machine and its personnel rather than of changing the policy or purpose of the administration itself. b) Problems of policy, in the sense in which that term is used here, are political and legislative. Most social investigations in recent years have been made in the interest of some legislative program or for the purpose of creating a more intelligent public opinion in regard to certain local problems. The social surveys conducted by the Sage Foundation, as distinguished from those carried out by the New York Bureau of Municipal Research, have been concerned with problems of policy, i.e., with changing the character and policy of social institutions rather than improving their efficiency. This distinction between administration and policy is not always clear, but it is always important. Attempts at reform usually begin with an effort to correct administrative abuses, but eventually it turns out that reforms must go deeper and change the character of the institutions themselves. c) Problems of human nature are naturally fundamental to all other social problems. Human nature, as we have begun to conceive it in recent years, is largely a product of social intercourse; it is, therefore, quite as much as society itself, a subject for sociological investigation. Until recent years, what we are now calling the human factor has been notoriously neglected in most social experiments. We have been seeking to reform human nature while at the same time we refused to reckon with it. It has been assumed that we could bring about social changes by merely formulating our wishes, that is, by "arousing" public opinion and formulating legislation. This is the "democratic" method of effecting reforms. The older "autocratic" method merely decreed social changes upon the authority of the monarch or the ruling class. What reconciled men to it was that, like Christian Science, it frequently worked.