Book excerpt: In 2001 AFIHM and the British HCI Group combined their annual conferences, bringing together the best features of each organisation's separate conference series, and providing a special opportunity for the French- and English-speaking HCI communities to interact. This volume contains the full papers presented at IHM-HCI 2001, the 15th annual conference of the British HCI group, a specialist group of the British Computer Society and the 14th annual conference of the Association Francophone d'interaction Homme-Machine, an independent association for any French-speaking person who is interested in Human-Computer Interaction. Human-Computer Interaction is a discipline well-suited to such a multi-linguistic and multi-cultural conference since it brings together researchers and practitioners from a variety of disciplines with very different ways of thinking and working. As a community we are already used to tackling the challenges of working across such boundaries, dealing with the problems and taking advantage of the richness of the resulting insights: interaction without frontiers. The papers presented in this volume cover all the main areas of HCI research, but also focus on considering the challenges of new applications addressing the following themes: - Enriching HCI by crossing national, linguistic and cultural boundaries; - Achieving greater co-operation between disciplines to deliver usable, useful and exciting design solutions; - Benefiting from experience gained in other application areas; - Transcending interaction constraints through the use of novel technologies; - Supporting mobile users.