Nationality (close connection of the person with certain culture/legal order) - Familiy law, marriage law, law of succession

Domicile and / or habitual residence (socialization of a person with regard to a certain place) - international treaties and conventions, domicile: Art. 26 I No. 3 IACC, habitual residence: Art. 4 I, 6 I Rome I

Place of Action(where the person has acted, relevant with regard to formal questions (Art. 11 alt 2 IACC)

Place of Result (In cases of tort / delict the connection is defined by place in which damage occurs (see Art. 4 I Rome II-VO)

Place where property is situated (often defines the connection. esp. immovable property)

Place of litigation (Procedural questions)

Partie's will/agreement (free will of private persons Art. 14III, 15 II, 26 IACC)