This paper reports the initial results of a study that was designed to develop and test an instrument that could identify the elements of an individual's capacity for lifelong learning. We anticipated that the components of this capacity would include a complex mix of dispositions, lived experiences, social relations, values, attitudes and beliefs and that these various factors would coalesce to shape the nature of an individual's engagement with any particular learning opportunity. The instrument that was developed--the Evaluating Lifelong Learning Inventory--was trialled with pupils across a range of ages and subject to factor analytic study. The data have proved robust over successive factor analytic studies, allowing the identification of seven dimensions of learning power and reliable scales to assess these. These dimensions appear to be capable of differentiating between efficacious, engaged and energized learners and passive, dependent and fragile learners. Whilst further, larger scale field trials will be necessary to confirm these early results, the findings would appear to have significant implications for conventional models of curriculum design and classroom practice.