A letter of invitation should not be sought.
Language Proficiency Requirements
None, English is sufficient. However, feasibility of conducting the project must be demonstrated in the project statement.
Additional Language Requirement
For research components without Arabic language proficiency, feasibility of conducting research in English must be demonstrated in the proposal. If Arabic is needed to conduct the research, the language proficiency evaluation must be completed.
For teaching, English proficiency is a requirement. Additional proficiency in Arabic is preferred and recommended for teaching in certain disciplines in the social sciences and humanities.