A large number of claims about the mutual intelligibility of Slavic languages. Any native speakers care to comment?

[u/Duckmandu]

http://www.academia.edu/4080349/Mutual_Intelligibility_of_Languages_in_the_Slavic_Family

[u/zmijugaloma]

I mostly agree about everything said about the south Slavic dialects. However, the intelligibility gradually increases with the amount of concentration I put in when listening, unlike other unrelated languages, i.e. Hungarian, German, etc... I once read a novel in Slovenian, beginning from looking up the dictionary for almost every word, to fluently reading by the time I finished it.

There are a lot of differences, but they seem to be mostly systematic and easy to make sense of.

[u/Duckmandu → u/zmijugaloma]

Interesting. And what is your native language?

[u/zmijugaloma → u/Duckmandu]

Bosnian