摘要:One of the aims of Higher Education is the promotion of Lifelong Learning and Self-Assessment (SA) could be considered as one of its main pillars. However, there are serious doubts about its reliability and validity as an evaluation tool. The aim of this correlational study is to explore SA accuracy contrasted to objective tests by comparing the results of the correlations between the SA tests conducted by 46 university (L2) English learners and their external evaluation, marked by teaching staff, for the purpose of testing the accuracy of SA. The SA tool used in the study was the Biography element of the European Language Portfolio (Form 3 of the ELP Passport for Adults); and that of the external evaluation was a model based on the Cambridge FCE tests administered by the UCLES. The results revealed that correlation on the overall scores were high, demonstrating that the students’ own assessments of their proficiency in the English language were accurate, being higher in the oral skills but lower in the written skills. The findings also revealed higher correlations in the expression skills than in the comprehension skills. This study contributes to affirm the accuracy and validity of SA as an evaluation instrument.