Today, science centres and museums have an important role in society to enrich young peoples cultural capital with regard to science and technology (S&T). This so-called science capital is for an important part dependent on the way families observe, discuss, and explore science and technology (Archer et al., 2012). To develop a large science capital it is not only important that young people gain knowledge about S&T, but also that they develop ways in which they can reason about this knowledge and connect it to their own context. The focus of the current project is on the way families in museums have conversations and explore together. The aim of the project is to develop and test a facilitator (i.e., explainers in science centres) approach that stimulates richer conversations and more intense exploration within families. The develop of this approach for facilitators is based on results form recent literature that shows that focussing attention on relevant observations is a pleasant and effective way to let children explore in a qualitative better way. The project entails an experimental study with three conditions of guidance, among which a control condition (no guidance) and two guidance conditions. Data from the control condition will be analysed to reveal interactions between families in relation to person characteristics. The hypothesis is that the guidance condition that focuses on the description of relevant observations, results in richer conversations and more intense experimentation within families.