Despite the technological advances in adapting web user interfaces to the small display of handhelds, the role that task nature plays in the formation of user attitude towards adaptive interface designs remains largely unknown. This study compares user readiness towards adaptive web interface design under different task contexts. Capturing such a situated user attitude is valuable for the designers of mobile websites to engage in user–centred design, enhance user experiences, and ultimately improve the viability of mobile information services. Based on a review of relevant theoretical frameworks, a research model was hypothesised and tested with experimental data. The results support the concept that mobile users are generally positive about adaptive interface design, and their preferences are more salient for complex tasks than for routine tasks.