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PurposeThe purpose of this paper is to propose and discuss a definition and a classification scheme for direct writing (DW) technologies.Design/methodology/approachBoth the definition and the classification are developed based on the perspectives of the growing DW community in the UK, through consultation with members, workshops and a survey across the community. In addition, current DW technologies and literature on classification techniques are reviewed.FindingsThe classification is structured in order to encompass current technologies, but also to be expandable to accommodate new ones that could be identified in the future as belonging to the DW remit. It is developed considering three dimensions related to DW: “Technology” to encompass all the processes, apparatuses, principles and tools which allow DW manufacturing; “Applications” to consider all the “types of manufactured goods” which could be produced with the DW technologies; and “Materials” which could be employed in DW manufacturing. The classification scheme is visualised into navigation maps and used as the basis of a software tool which can allow the community to exchange information on DW.Research limitations/implicationsThe paper proposes a classification as a tool for knowledge exchange and to support knowledge organisation and retrieval. However, the classification proposed in this paper might not be the only possible solution.Practical implicationsThe definitional framework is proposed to the DW community as a language tool to help communication among members with different perspectives and to be used to support the creation of information databases. It is embodied in a software tool through which they could file personal profiles (i.e. their expertise and interests) and hence map the community.Originality/valueIt is evident that, due to the heterogeneity of the community of scientists and practitioners interested in these technologies, many perspectives coexisted and that a communication platform is required. The authors decide to develop a classification which could be flexible enough to encompass new emerging technologies as the use of classifications as tools for supporting communication across the scientific community is well known and as the authors could not identify in literature any other DW technology classification which could satisfy these requirements.

Lithography-based integrated circuit fabrication is rapidly approaching its limit in terms of feature size. The current alternative is nanotechnology-based fabrication, which relies on self-assembly of nanotubes or nanowires. Such a process is subject to a high defect rate, which can be tolerated using carefully crafted defect tolerance techniques. This paper presents an algorithm for reconfiguration-based defect tolerance in nanotechnology switches. The algorithm offers an average switch density improvement of 50% to 100% to most recently published techniques. The algorithm is also consistent in improving the yield through minimizing false rejects as the results show over a large sample. The improvement percentage varies depending on the manufactured switch size and the desired defect-free size with the improvement in efficiency directly proportional to the size of the switch.