This study was conducted to identify petroleum engineering students’ motivational and attitudinal orientations in learning the English language. To achieve this objective, two research tools were used namely, questionnaire and interviews. This type of design, that uses different research methods to investigate the same issue, is called a triangulation mixed method design (Creswell, 2002). The need for triangulation arises from the ethical need to confirm the validity and reliability of the process (Tellis, 1997). In addition, using multiple methods in a research design would also help to “give a fuller picture and address many different aspects of phenomena” (Silverman, 2000, p.50).