When parents produce utterances that are just slightly above the level of their child, they will be providing a more appropriate model for their child to imitate than typical adult speech. Communication at the level just above the child’s current production level is said to be taking place in the “Zone of Proximal Development”, or the child’s ZPD. The ZPD is the level of complexity at which the child is able to perform, but they may need a slight amount of assistance to attempt language at that level independently. By challenging the child to perform within their ZPD, parents are encouraging the child to produce language at a slightly higher level than they have been previously; therefore, increasing the child’s complexity little by little. Parent language that is produced within the child’s ZPD is easier for the child to imitate, which can result in a higher number of child productions (Wright, Roberts, & Kaiser, 2012).