This review aimed to present some of the leading causes of ear disease and hearing loss globally, and to identify their impact at both an individual and societal level.

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Many contemporary reference works that address learning-curve theory incorrectly apply the basic equation established by Dr. T.P. Wright in 1936 incorrectly. The result is that estimates based on these texts overstate project time requirements by as much as 30%! By means of a worked example using recent data, this paper redevelops the theory from first principles. Interested readers may use the step-by-step method described within to establish the correct rate of learning applicable to their own organizations, thereby improving their productivity.

Objective Chronic suppurative otitis media is a major global disease disproportionately affecting low- and middle-income countries, but few studies have explored access to care for those with ear and hearing disorders. Method In a tertiary hospital in Cambodia providing specialist ear services, a mixed method study was undertaken. This study had three arms: (1) quantitative analysis of patients undergoing ear surgery, (2) a questionnaire survey and (3) semi-structured in-depth interviews. Results Patients presented with advanced middle-ear disease and associated hearing loss at rates that are amongst the highest per capita levels globally. Patients reported several structural, financial and socio-cultural barriers to treatment. This study showed a significant burden of ear disease in Cambodia, which reflects a delay in receiving timely and effective treatment. Conclusion This study highlights the opportunity to integrate effective ear and hearing care into primary care service provision, strengthening the package of activities delivered at government facilities.