Executive function is best measured in loosely structured, multi-component tasks that reflect real-life demands. These tasks require participants to develop a strategy, keep a plan in mind and monitor time. Errors include ignoring stated goals ("goal neglect"), over-allocation of time to one task and violating rules. Teasing apart such errors can be complicated and these assessments can be difficult to control and time-consuming to administer. This paper reports an evaluation of a new, easy-to-administer computer-based multiple component test, the Computerised Multiple Elements Test (CMET). In Study 1 20 older adults (55-70 years) completed the task under different conditions. Study 2 examines the relationships between CMET and performance on measures of related constructs. The results show that poor CMET performance correlated with self-reported frequency of everyday cognitive lapses. There is a reasonable basis for further exploration of the CMET as a quick, practical and potentially sensitive measure of organisational skills.