Motivation – Choice architecture (Thaler & Sunstein, 2008) is a phrase of the moment among politicians and economists seeking to influence public behaviour, but the relevance of the concept to designers has received little attention. This paper places choice architecture within the context of Design with Intent–design intended to influence user behaviour. Research approach – The concepts are introduced and choice architecture is deconstructed. Findings/Design – Affordances and Simon’s behavioural model (1955) help understand choice architecture in more detail. Research limitations/Implications – This is only a very brief, limited foray into what choice architecture is. Originality/Value – User behaviour can be a major determinant of product efficiency: user decisions can contribute significantly to environmental impacts. Understanding the reasons behind them, a range of design techniques can be identified to help users towards more efficient interactions. Take away message – The intended outcome is a useful design method for helping users use things more efficiently.