Czy "trzecia misja uczelni istnieje"? Zmierzyć niemierzalne [Does the "third mission of the university exist"? Measuring the unmeasurable] Tomasz Janoś (Wrocław Academic Hub - WCA & SzD NZJ, PWr, Wrocław) Universities are in the business of teaching and research. Should they be doing anything else? Policies at various levels encourage universities to "engage with the public", "cooperate with the socio-economic environment", etc. Is this the same kind of activity that universities usually do, or is it fundamentally different? Is it even possible to establish an appropriate cross-national and cross-system uniform definition, and furthermore to operationalize reliable metrics and indicators? In this talk I will outline the advantages and disadvantages of the different theoretical and practical approaches and try to draw reasonable conclusions for the local context.