Explainers – also known as mediators, museum educators, science communicators, edutainers, pilots, and others – have a strategic role in science centres and museums as facilitators of visitors’ learning, and more recently, as mediators in the dialogue between science and society. Their basic training is usually focused on how to engage the public in the range of activities offered in their centre. Quality training builds explainers’ professionalism and, as a consequence, their freedom to adapt to changing contexts and develop new content, innovative methodologies and original formats for their activities. What kind of training is more effective to promote an explainer’s personal development?