 Complete the following phrase:  This later reform was presaged by a reform in the middle of the 1950s; the economic historian Jörg Roesler considers the NES in the 1960s as a continuation of this reform. The origin of the reform in the 1950s was a scientific study, commissioned by Raus ministry in 1953, to assess the need for greater economic efficiency in the factories. The subsequent results from this study promised enhanced economic efficiency by shifting more responsibility from the National Planning Commission to the enterprises themselves. Thenceforward, already in spring 1954, Rau advocated such a planning reform, while planning boss Bruno Leuschner quite consistently opposed it. In August 1954, Raus ministry sent a concept for such a reform to Leuschners State Planning Commission. Eventually this reform got under way, after Ulbricht, perhaps under the influence of his new personal economic adviser Wolfgang Berger, had approved such a policy at the end of 1954 too. Subsequently, the reform accelerated until 1956. It found however its early end in the generally aggravated political atmosphere in 1957. Unrests in other Eastern Bloc countries during the previous year 1956, in particular 