This paper aims to analyze the factors that encourage and the factors which discourage Petra Christian University’s English Department students to do code-switching using Braun & Clarke’s (2006) analytical procedure. To obtain the necessary data, we distributed questionnaires related to code-switching phenomena to 47 students of Petra Christian University’s English Department and interviewed 21 of the selected respondents from both English for Creative Industry and English for Business majors. The questionnaire and interview questions inquired regarding the interlocutors and the factors which respectively encourage and discourage them to practice code switch. Findings indicate that communication efficiency, foreign language practice, habit, level of intimacy, and inability to translate English expressions to Indonesian encourage English Department students of Petra Christian University to perform code switching. Meanwhile, proficiency level, professionalism, potential misunderstanding, and level of intimacy discourage English Department students of Petra Christian University from performing code-switching.