• Panels of 600 households in each country from low-income urban and rural communities, each with at least one member with high blood pressure, followed up over 18 months.

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• An embedded micro-costing study among 5 hypertensive individuals in each community.

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• Recruitment of 40 people with hypertension per country, with repeat in-depth interviews at recruitment and 12 months.

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• Completion of audio/text/video diaries via mobile phone during the interim period describing health-seeking behaviour.

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• Focus group discussions in 6 different communities in each country (mix of urban/rural).