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.