Singapore's Build-To-Order public-housing applicants do not choose flats according to who reaches an office first. Under official guidance from the Housing & Development Board, a computer ballot assigns each application a queue number, and shortlisted applicants are invited to select a flat in that order. Government material from 2013 also shows that applications were already submitted through HDB's online service or self-service kiosks.
This queue is invisible on the pavement. It is an administrative order created by a ballot. When demand for a development or flat type is heavy, an applicant may wait for a number to be called only to find that a preferred unit is no longer available. Fairness is designed through eligibility rules and random allocation rather than the ability to camp overnight or arrive before dawn.
Housing is the setting of everyday life, and the floor, orientation and layout selected within one development can shape a family's future. A queue number is therefore more than a receipt. The system removes the physical line while preserving the order of choosing a home as an explicit, invisible queue.