Journal of E - Technology Boris Galitsky, Dmitry Ilvovsky 11 1 2020 https://doi.org/10.6025/jet/2020/11/1/32-41 http://www.dline.info/jet/fulltext/v11n1/jetv11n1_4.pdf In this work, we described how to validate the soundness of textual explanations in a domain-independent scenario. Then we proceed to find how the users understand the descriptions and which are the factors determining whether explanations are acceptable. This work found that the discourse tree (complete DT) determines the acceptability of explanation. A complete DT is a sum of a traditional DT for a paragraph of actual text and an imaginary DT for a text about entities used but not explicitly defined in the actual text.