“…However, regarding the reasons for the difficulty of English pronunciation, particularly, related to students' L1, the result of the study is consonant with some studies (e.g., Breitkreutz, Derwing, & Rossiter, 2001;Derwing & Rossiter, 2002;Jenkins, 2000;Saito, 2014;Ufomata, 1996) which conclude that vowels and consonants are the essential features of pronunciation along with sounds in combination, stress and intonation. For example, Derwing and Rossiter (2002) have discovered that with regards of the respondents' L1 background, the vast majority of pronunciation problems identified by students were segmental features (i.e., consonants and vowels). Likewise, Jenkins (2000) with her proposal of Lingua Franca Core (LFC) emphasizes the balance of segmental features (i.e., consonants, consonant clusters, and vowels) and suprasegmental features (i.e., nuclear stress) along with the effective use of articulatory setting.…”