This paper reports research, which aims to validate design knowledge, as the products of a structured analysis and design method (MUSE – Lim and Long, 1994). The products or ‘containers’ of the method (MUSE(C)) are used in the re-design of a range of domestic technologies, intended to support dementia care in the home. The case-study is judged a success. An evaluation showed the technologies to be more effective following re-design. The design products were shown to be correctly operationalised. Problems in their application are documented. MUSE(C) can, thus, only be considered to have been partially validated. The solution of these problems constitutes a requirement for future research