0 Dónal Doyle John Loughrey Conor Nugent Lorcan Coyle Pádraig Cunningham 2004 Expert Update 8 1 11-14 06/2005 case based reasoning, fionn, machine learning We introduce the Fionn framework for developing CBR systems. We outline the evaluation framework that underpins the feature selection and similarity learning process and we present a brief description of the Explanation-Guided Retrieval mechanism in Fionn.