The effects of globalization are increasingly felt all over the world. The world is becoming more homogeneous, since different kinds of products can be offered to a wider range of customers. One of the essential preconditions for free movement of goods between states and unions of states is harmonisation of their technical requirements. The EU has determined requirements for goods in order to avoid any damage they could create for human health, life and environment. Thus, the importance of conformity assessment grows along with increase of trade volumes between states. The conformity assessment sphere is characterised by guaranteed product safety: product compliance with certain requirements is certified. The article aims to evaluate technical harmonization of product requirements, conformity assessment system, to analyse its development and changes before and after Latvia’s accession to the EU single market. The research reflects the relationship between the conformity assessment system, its elements and economic development. Main research methods are analysis and comparison. Research restriction—product conformity assessment. In the results of the research, the authors conclude that the conformity assessment system, which consists of several elements: accreditation, standardization, metrology, is a precondition for successful integration in the global market.