Abstract
Recognize the contributions of physical capital, human capital, and the rest of the other factors in the process of economic growth, according to an expanded approach of growth accounting. The study covered the period from (1970-2008) depending on annual data for the variables of this study. The gross fixed capital formation is used as an indicator of physical capital, and one of the objectives to reach a suitable estimate of the human capital that used in the analysis. Calculation the work item index and average wages using data on years of education, and the return from Education (intended here wages received by the worker). This method determining the weights of the various levels of educational attainment based on the rate of return, which received from the education, and the element of the adjusted Labor of human capital (or wages). The human capital is an index measuring the contribution of the skilled work rate element which is very good at the distribution of education gained by the country. The human capital is best measured by average years of schooling of the workforce. The study Applied the co-integration approach to estimate the elasticity of production for physical capital, then used ordinary least squares method to estimate the solow residual, Therefore the total factors productivity, the results of the study shows that physical capital accumulation plays an important role in economic growth in the Sudan during the period of 1970-2008, while human capital comes second in terms of importance. As well as show that the growth rate of total factors productivity factors in Sudan was very low and it takes negative values in some periods, especially during 1980 and 1990. The study proved that the total factors productivity does not play an important and decisive role in the economic growth process in Sudan during the period of study.