One of the more interesting fields of application for augmented reality is cultural heritage. Designing augmented reality interfaces in this domain is difficult because it involves, among other things, the selection and interpretation of multidimensional information, the intervention of persons from multiple disciplines and the design of the presentation and the interaction with the user. We present a methodology that takes into account all these factors and that is supported with an innovative use of multimedia sketches. Keywords Design methodology; sketches; augmented reality; multimedia narration; mobile computing.