Purpose: The purpose of this research paper is to analyse the internship expectations gap amongst the three main internship stakeholders: employers (company supervisors), academic supervisors and students, in an effort to detect the variables which could assist closing the gap between students' perceptions and the labour market employers and then, between the academic supervisors in Higher Education Institutions (HEIs) and the students. This paper analyses firstly, the variables that determine students' perceptions and overall satisfaction with the internships. After, it examines the differences with the employers' expectations of the interns' performance. Finally, this paper analyses the variables that determine the academic supervisors in HEIs grading of the interns with the overall satisfaction about the students' internship performance. This research serves as a guide for the improvement, refinement and expansion of university internship programme design together with internship best practices definition to close the expectation gaps between the HEIs and the Business World. Design/methodology/approach: Two quantitative surveys were designed to measure students' and employers' perceptions of the internships. Additionally, one semi-structured qualitative interview is performed to deepen understanding of each student's perception of the internship. The authors perform a triangular analysis of students' perceptions and employers' (company supervisors) and academic supervisors' expectations. A T-test analyses the differences between cognitive, transversal and social skills developed in an internship as perceived by students and employers (company supervisors). Finally, linear regressions are run both to identify the variables that determine the students' internship overall satisfaction and also detect the variables that determine the final internship grade assigned by the academic supervisor from the university. Findings: The authors highlight the following interesting findings. While the students feel that the internships are highly useful and perceive that they were fully integrated into the company's culture, they also state that they learn how to develop their transversal skills much more than the cognitive skills learnt in the whole study programme in their degrees. In parallel, employers (company supervisors), for their part, perceive that students have strong social skills and adjust perfectly to the company's culture, but expected the students to have more creativity and cognitive skills. Finally, the academic supervisor's value the students' written skills together with the company's supervisor valuation more than the students' transversal skills. These main expectation gaps detected must be solved to improve internship outcomes and closing the gaps between the Higher Education and Business World. These findings consolidate existing research and add more quantitative results contextualised to Spanish Higher Education Institutions. Research limitations/implications: The limitations of this research are that it only embeds a HEIs in Spain and the sample should be enlarged with more universities not only from Spain but also from around the world. Thus, the findings in this research can be used to improve the internship programme in this HEIs and its best practices, however they cannot be extrapolated to other HEIs still. Nevertheless, other HEIs can learn from this experience. Regarding the surveys these can be reviewed and homogenised for the student's perception items to be more aligned with the company supervisor's expectations and the academic supervisor's requirements of an internship. As implications, the authors have divided them into theoretical and practical. From the theoretical point of view, there needs to be more research about internships done in Economics, Law and Business Degrees field. From the practical point of view, the authors highlight several implications. First, HEIs must develop internship programmes further and promote the three stakeholders, employer–academic supervisor–student communication more fluid. This communication flow will maximize and align both employer and academic supervisor expectations about the students' performance in their internships. This way, student perceptions of their internship experience will improve and align further. Second, internships must be promoted in the Economics and Business Degrees as they are a unique opportunity for students to apply cognitive, transversal and social skills acquired in their study programmes, developing themselves as future professionals. Third, there is a growing need for HEIs to strengthen links with different companies, not only to teach students the skills employers' value but also to ensure that graduates are aware of what is happening in the labour market. Finally, through the internships developing further, academic supervisors must open their assessment to the students' professional skills (critical thinking, creativity, capacity to solve short term problems efficiently,) aligning with labour market needs. Originality/value: This paper is significant because it shows the growing need for universities to strengthen links with a variety of companies (Business World). Internships are becoming compulsory, having assigned a high percentage of European Credits Transfer System (ECTS) credits to students' Grade Point Average (GPA) in Economics, Law and Business. This research work shows HEIs should improve internship design to close the gap between Higher Education's supply of graduates and the business world's demand for adequately prepared professionals. The results in this paper can help the academic actors start improving the internship design and best practices definition. [ABSTRACT FROM AUTHOR]