Limited international competition is conducted by narrowing the competitive field to a short list of prospective offerors. This is pre-determined through a non-discriminatory evaluation of qualifications. Such a process may involve various sourcing methods, such as: a. Use of existing rosters; b. Shortlisting from previous rounds of prequalification or expressions of interest from another selection process, assuming similar goods or services; c. Previous vendors of known satisfactory performance; d. Referrals of vendors from other UN entities; e. Publicly accessible trade books and online databases; f. Advertised call for expressions of interest; g. Conventional business directories