Subject headings related to missions and world Christianity are many and varied. The most basic forms are:

• Missions--[name of country]
• [name of country]--Church history

In the interests of simplicity and standardization, a set of approximately fifty subject headings is drawn upon for base level cataloging of missions material in Orbis. These are the most commonly used subject headings in Orbis:

For sending agencies, the impact of Western missions:

• Missions--[name of country]
• Missions--Educational work
• Missions--Linguistic work
• Missions--Theory
• Missions, Medical--[name of country]
• [a people group]--Missions to
• Missionaries, Medical
• Missionaries--[name of country]--biography
• Missionaries--Training of
• Women missionaries

Integrating Christianity into non-Western context:

• Christianity and culture--[name of country]
• Church and social problems--[name of country]
• Church work with the poor--[name of country]

Indigenous church bodies, actions, groups, etc:

• [name of country]--Church history
• Christianity--[name of country]
• Christian sects--[name of country]
• Catholic Church--[name of country]
• [denomination]--[name of country]
• Pentecostal churches--[name of country]
• Christian education--[name of country]
• Christian literature, [language]
• Christian literature--Publication and distribution--[name of country]
Evangelistic work--[name of country]
• Theology, doctrinal--[name of country]