The aim of the article is an attempt to measure the level of development of a Knowledge-Based Economy (KBE ). The applied Knowledge Assessment Methodology (KAM), developed by the World Bank in 1999, is one of the methods for measuring the degree of development of KBE. It is connected with the development of a set of indicators describing the functioning of individual socio-economic dimensions, grouped into four categories: (A) economic and institutional, (B) education and human resources, (C) information systems and new technologies, (D) information technologies. The analysis of these pillars helps to gain a competitive advantage (region, industry, national economy). Synthetic indexes for Polish voivodeships in 2009-2016 were calculated. The research results present a significant spatial difference in the development of KBE. Changes in this diversification of voivodeships were presented for 2015 and 2016 in relation to 2012 and 2009.