Data collection is based on definitions approved by the participating Member States. The Definitions below have been shortened and edited for publication purpose.
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Macroeconomic data: GDP, general government expenditure and population are based on data from Eurostat.
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Total defence expenditure is defined as total Ministry of Defence (MoD) expenditure and defence related expenditure from other sources (other Ministries' special budgetary lines).
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Civilian personnel: the authorised strength of all civilian personnel on 31 December of each year employed by all military establishments and the Armed Forces.
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Military personnel: the authorised strengths of all active military personnel on 31 December of each year; includes all personnel in uniform who can operate under military command and can be deployed outside national territory.
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Internal security military personnel: gendarmerie-type forces, financed by the MoD budget, but dedicated solely to internal security tasks.
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Personnel expenditure: all personnel-related expenditure for military and civilian personnel, including from non-MoD sources.
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Infrastructure/construction expenditure: expenditure for all construction of fixed military installations necessary for the exercise of command and efficient functioning of military forces, including country's share in multinationally funded military construction/infrastructure.
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Investment: defence equipment procurement and R&D (including R&T) expenditure.
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Defence equipment procurement expenditure: expenditure for all major equipment categories, that are not included in O&M spending.
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Defence Research and Development (R&D) expenditure: any R&D programmes up to the point where expenditure for production of equipment starts to be incurred. R&D includes R&T.
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Defence Research and Technology (R&T) expenditure: expenditure for basic research, applied research and technology demonstration for defence purposes. It is a subset of R&D expenditure.
- Operation and Maintenance (O&M) expenditure: covers O&M (spare parts and supplies) of major equipment, other equipment and supplies, and costs related to maintaining utilities and infrastructure.
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Operations costs: all national expenditure to cover incremental (extra) costs linked to deployed operations outside the EU Member States' territory.
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Outsourcing: defence expenditure for which services have been contracted at central level with service suppliers from outside the MoD and/or Armed Forces.
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Collaboration: agreement by at least two Ministries of Defence for project or programme contracts.
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European Collaboration (a subset of Collaboration): agreement by at least two EU Member States' Ministries of Defence for project or programme contracts. Possible non-EU partners' share in such contracts is lower than 50%.
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Average number of troops deployed: average number of troops deployed throughout the year by all EDA participating Member States (all Armed Forces).
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Deployable (Land) Forces: strength of (Land) Forces troops structured, prepared and equipped for deployed operations (the NATO 50% usability target).
- Sustainable (Land) Forces: strength of (Land) Forces troops undertaking or planned for sustained operations, including those on high readiness standby (the NATO 10% usability target). It is a subset of Deployable (Land) Forces.
Note: until 2008 Personnel expenditure had a breakdown: (1) Pay and allowances paid to: military personnel; civilian personnel. (2) Pensions – only if paid directly by the MoD to: retired military personnel; retired civilian employees.