:::::::::::::Why it must be like that? Why isn't Bosnian, Croatian, Serbian and Serbo-Croatian part of Shtokativan (as it is)? Modern Croatian does not use Kaykavian and Chakavian officialy, even if they talk in these dialects in some parts of Croatia, and even if they mention them in literature as part of Croatian. All 3 (or 4) languages are officially based on Shtokavian!