 For example, the introduction of open enrollment in UK secondary schools after 1988 (whereby parents could choose which secondary school to send their child to, rather than being limited to the nearest) led to popular schools being oversubscribed.This allowed these schools to select which pupils they would accept, leading some to discriminate against children from low-income backgrounds or non-traditional family structures (e.g.inviting "both" of a child's parents to an informal meeting with the headteacher so as to determine by stealth whether the child comes from an "appropriate" family).