In this thesis, I will study the structure of two constructed Slavic interlanguages from different eras : Ruski Jezik, created by Juraj Križanić in the middle of the 17th century, and Interslavic,...Show moreIn this thesis, I will study the structure of two constructed Slavic interlanguages from different eras : Ruski Jezik, created by Juraj Križanić in the middle of the 17th century, and Interslavic, a contemporary project led by Vojtěch Merunka. I will discuss the different solutions they offer to tackle the issues of mutual intelligibility amongst the native speakers of Slavic languages. In part one, I will examine the factors of mutual intelligibility and different approaches to Slavic mutual intelligibility. In part two, I will review the common and divergent features of Slavic languages in different areas, and analyse the grammars of both interlanguages in order to discuss the solutions they bring to issues in mutual intelligibility.Show less