Home-based records have been used in both low- and high-income countries to improve maternal and child health. Traditionally, these were mostly stand-alone records that supported a single maternal and child health-related programme, such as the child vaccination card or growth chart. Recently, an increasing number of countries are using integrated home-based records to support all or part of maternal and child health-related programmes, as in the maternal and child health handbook. Policy-makers' expectations of home-based records are often unrealistic and important functions of the records remain underused, leading to loss of confidence in the process, and to wasted resources and opportunities for care. We need to examine the gaps between the functions of the records and the extent to which users of records (pregnant women, mothers, caregivers and health-care workers) are knowledgeable and skilful enough to make those expected functions happen. Three key functions, with increasing levels of complexity, may be planned in home-based records: (i) data recording and storage; (ii) behaviour change communication, and (iii) monitoring and referral. We define a function-capacity conceptual framework for home-based records showing how increasing number and complexity of functions in a home-based record requires greater capacity among its users. The type and functions of an optimal home-based record should be strategically selected in accordance not only with demands of the health system, but also the capacities of the record users.