There are multiple substitutions occurring within the media for K-12 classroom instruction. Modular software and video are loosing market share. Comprehensive courseware is gaining market share now, but will reach its peak of market share in about 2010, and then begin to decline. Online courseware is gaining market share now and will reach a penetration of 60% by 2020.
Data: The Complete K-12 Report, Education Market Research, 2006, 2005, 2004, 2003, 2002 & 2001