Even though William Howard Taft and Theodore Roosevelt were progressivists, their politics and administration were different.
Roosevelt prefered rough-and-tumble politics, had many ides and schemes, but he ususally left all the details of administering to others.
Taft were calmer and approached things slower. He finished Roosevelt`s job dealing with big businesses, prosecuting twice as many as Roosevelt had.
He came to the White House promising to hold Roosevelt`s legacy but decided to execute the existing law than demanding new legislation from the Congress.
Generally, it is known that the Taft`s administration is considered a failure because he changed the course of the progressive program started by Roosevelt to reactionary conservatism.