The study aims to explain the changes in the sources of information for innovation used by Portuguese small and medium-sized enterprises (SME) comparing two 3-years periods: 2002-2004 and 2010-2012. For this purpose, it was used the data from the Community Innovation Survey (CIS) published in 2004 (CIS 4) and 2014 (CIS 2012). Comparative analysis reveals that there was a greater incidence of innovation activities in SME, mainly due to the use of their own knowledge resources and of their customers. The interaction with the scientific and technological system showed to be modest, although it has been detected in the medium-sized enterprises an appreciable increase on related sources – including higher education institutions, Government and research centres. Despite being a strictly descriptive analysis, evidence gathered through graphical analysis suggests a slight change along the last decade towards to organizational and technological innovations within Portuguese SME, based on knowledge networking.