A great deal of research within science and engineering education revolves around academic success and retention of science and engineering students. It is well known that South Africa is experiencing, for various reasons, an acute shortage of engineers. Therefore, we think it is important to understand the factors that contribute to attrition rates in university students, and engineering students in particular. The theoretical framework for the present study draws on self-regulation theory, with particular reference to the role of self-efficacy and academic commitment. Participants comprised 127 engineering students in the second year of an augmented programme. They completed the Academic Commitment Scale and the Materials Science Self-efficacy Scale. Statistical analysis included correlation and regression analysis to test the hypothesis that self-efficacy and academic commitment would predict the semester mark. Our results indicated that materials science self-efficacy and meaningfulness are significant predictors of investment, and that investment predicts the final semester mark. We discuss the results in terms of debates about throughput and retention for engineering students and also implications for teaching and learning.

Student retention remains an ongoing concern for higher education institutions worldwide. In the present study we examine the predictive utility of identity styles, professional identity and academic commitment to academic achievement. We asked 120 second year students in the profession of engineering in an augmented degree programme to complete the Identity Styles Inventory-3, the Engineering Identity Factors Inventory, and the Academic Commitment Scale. We found that a normative identity style predicted professional engineering identity and meaningfulness, which predicted the participants' investments in their studies. Additionally, a diffuse-avoidant identity style negatively predicted professional identity, meaningfulness and satisfaction, which provides empirical evidence of the contribution of identity to academic commitment. None of the variables we studied predicted academic achievement. Our findings are relevant given current debates on access, equity and decolonisation in higher education, because it suggests that students' sense of identity largely influences whether they feel a sense of belonging at university. Although identity styles and meaningfulness are not significant direct predictors of academic achievement, they probably do have an indirect effect on academic achievement through their direct influence on investment.