Invariant prescription refers to a single directive given to parents, designed to create clear boundaries between parents and children.

Invariant prescription refers to a parenting style that involves setting clear rules and boundaries for children, and consistently enforcing those rules regardless of the situation. This approach is designed to create structure and predictability for children, and to help them understand what is expected of them. Invariant prescription is often contrasted with "reactive prescription," which involves adapting the rules and boundaries based on the specific circumstances or the child's individual needs.

Some examples of invariant prescription may include setting consistent bedtimes and routines for children, requiring them to follow certain rules of behavior at all times, and enforcing consequences for breaking the rules. This approach can be effective in helping children understand and follow rules, but it may also be inflexible and may not take into account individual differences or changing circumstances. It is important for parents to find a balance between structure and flexibility in their parenting style to meet the needs of their children.