Visitors may gain an insight into the workings and material of the course. Visitors may experience for themselves how a few simple measurements can identify energy savings in their homes. Registered students can prepare on OpenLearn before the course website opens, in particular by starting their systematic monitoring of home energy usage. This study unit is just one of many that can be found on LearningSpace, part of OpenLearn, a collection of open educational resources from The Open University. Published in ePub 2.0.1 format, some feature such as audio, video and linked PDF are not supported by all ePub readers.