In particular , the IAS identifies four conditions under which grade skipping is unwise :
One metric used for determining whether grade skipping is appropriate is the research - based Iowa Acceleration Scale , which entered its third edition in 2009 .
The Iowa Acceleration Scale identifies four conditions under which grade skipping is unwise :
One metric used for determining whether grade skipping is appropriate is the research - based Iowa Acceleration Scale , which entered its third edition in 2009 .