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In recent publications on the use of portfolios in professional training both their goals, application and success are reported in favourable terms. The main purpose of portfolios being put forward are: documentation of performance, monitoring growth, revealing discrepancies in development and enhancing self-responsibility. The findings, however, pertain to the introductory implementation of the portfolio instrument, most notably with (student) teachers. Not much is known about the sustained use of a portfolio as an instrument to support professional development in the long term. In this study the benefits of different forms of sustained portfolio use are focussed on in particular. Use is related to the portfolio's function, which can be for both professional development and certification, and to the setting and condition of use, which may be either mandatory or voluntary. We gauge its impact on indicators like ongoing documentation, systematic reflection, dialogue with significant others and learning for professional development. The difficulties experienced users found are discussed, as well as the gains they saw in sustained use of portfolios, which led us to conclude that portfolios are mainly used for documentation but have a high potential as mirrors of competence when issued as instruments for self-evaluation and self-assessment.