As digital technologies have become the predominant interfaces of everyday work, life, and society, preserving human-centredness in human–computer interaction (HCI) design remains the guiding commitment in the field as it transitions from relative novelty into day-to-day prominence. This chapter introduces design concepts within the HCI domain, highlighting the need for robustness and adaptability to meet ever-shifting design goals motivated by user, organisational, and technological changes. The history of design research is traced from early contemporary approaches to modern methods of HCI and human-centred design. Practical guidance for implementing these approaches is outlined, emphasising respective suitability to foster creativity, innovation, and inclusion. Insights into some non-common HCI methods are offered as contrasts for their potential impact on future HCI conventions. Discussion is offered towards lessons from recurring opportunities and challenges when designing for diverse user groups amidst systemic social change arising from new technologies. This highlights the value of introspection and reflection when incorporating HCI design into product/system lifecycles. The principles underlying these methods present a call-to-action for the HCI community to engage in forward-thinking dialogue and collaborative research to shape future technologies by embracing the aspirations of all people at the centre of our designed experiences inclusive of recreation, work, fulfilled living, and society at large.