More recently, electronic workbooks have permitted interactive and customized learning. Such workbooks may be used on computers, laptops, PDA's, and may be web-based.[http://en.wikipedia.org/wiki/Workbook] | More recently, electronic workbooks have permitted interactive and customized learning. Such workbooks may be used on computers, laptops, PDA's, and may be web-based.[http://en.wikipedia.org/wiki/Workbook] |