"Shared book reading" (also known as "interactive shared book reading") encompasses practices that adults can use when reading with children, which are intended to enhance young children's language and literacy skills. During "shared book reading," an adult reads a book to an individual child or a group of children and uses one or more planned or structured interactive techniques to actively engage the children in the text. In 2006 and 2007, the What Works Clearinghouse (WWC) conducted systematic reviews of all of the studies that examined the impact of "shared book reading" (September 2006) and "interactive shared book reading" (January 2007) on preschoolers' learning. The WWC has combined and updated these reports to include more recent publications. Based on the most recent available evidence, the WWC found that "shared book reading" (now including "interactive shared book reading") has mixed effects on comprehension and language development and no discernible effects on alphabetics and general reading achievement for children under age 6 and not yet in kindergarten. The WWC continually reviews new research studies, updating intervention reports periodically. This report replaces the September 2006 and January 2007 reports, which found mixed effects on oral language, potentially positive effects on phonological processing and early reading/writing, and no discernible effects on print knowledge. A glossary of terms is included. Appended are: (1) Research details for Bochna, 2010; (2) Research details for Box & Aldridge, 1993; (3) Research details for Lamb, 1986; (4) Research details for Mason et al., 1990; (5) Research details for Mautte, 1991; (6) Research details for Walsh, 2010; (7) Research details for Justice et al., 2010; (8) Research details for Pollard-Durodola et al., 2011; (9) Outcome measures for each domain; (10) Findings included in the rating for the comprehension domain; (11) Findings included in the rating for the language development domain; (12) Findings included in the rating for the alphabetics domain; (13) Findings included in the rating for the general reading achievement domain; (14) Supplemental follow-up findings for the comprehension domain; (15) Supplemental subgroup findings for the language development domain; (16) Supplemental 1-year and 2-year follow-up findings for the alphabetics domain; and (17) Supplemental subgroup findings for the general reading achievement domain. [To access the 2006 report in ERIC, see ED493778. To view "Interactive Shared Book Reading. What Works Clearinghouse Intervention Report" 2007, see ED497615.]