Secondment

In international affairs and policy work, a secondment is a temporary posting in which a staff member is loaned by their parent institution—typically a national ministry, military, university, or NGO—to another organization for a fixed period, commonly six months to three years. The seconded individual usually retains their original contract, salary, pension rights, and seniority, while taking on the duties and reporting lines of the host body.

Secondments are a structural feature of how international organizations are staffed. The UN Secretariat, OECD, NATO International Staff, the European External Action Service (EEAS), and the European Commission all rely heavily on Seconded National Experts (SNEs), who are civil servants paid by their home governments but working inside the institution. The EEAS, for example, was built partly by drawing diplomats on secondment from EU member-state foreign ministries. Within NATO, Voluntary National Contributions and seconded officers fill specialist roles alongside permanent international staff.

The mechanism has both advantages and tensions. For host organizations, secondments inject specialist expertise without inflating permanent headcount. For sending governments, they build institutional knowledge and informal influence—critics sometimes describe this as a form of soft staffing leverage, since seconded personnel may retain loyalties to their capital. To mitigate this, most international bodies require secondees to act solely in the interest of the organization and to refrain from taking instructions from national authorities, mirroring Article 100 of the UN Charter's independence principle for international civil servants.

Secondments are also common between think tanks, ministries, and academia—for instance, scholars rotating into policy planning units, or diplomats taking research fellowships at institutions like Chatham House or the Council on Foreign Relations. For early-career researchers and MUN alumni, secondments are a frequent gateway into multilateral careers, often arranged through national Junior Professional Officer (JPO) programmes or EU traineeship-to-SNE pipelines.