Literacy development has been found to have a considerable influence on individuals' lives, modern society, and its economy. As a consequence, a great deal of attention has been devoted to facets of literacy, conditions that facilitate its development, and its impact. This special issue of Canadian Psychology provides a sample of current research programmes carried out on development by Canadian researchers in psychology and education. The topics addressed include emergent literacy, longitudinal prediction of reading development, development of oral reading and reading comprehension, development amongst French immersion students, importance of culturally and developmentally appropriate practices in instruction, and prevention of reading difficulties. The concluding article provides an overview of current definitions of learning/reading disabilities in Canadian provinces and territories. Keywords: development, emergent literacy, prediction and prevention of reading difficulties, development of oral reading and reading comprehension, reading instruction The Universal Declaration of Human Rights adopted in 1948 set forth principle of education for all and universal literacy. Still today, it is estimated that over 770 million adults around world are illiterate, including 130 million young people (ages 15 to 24), and these estimates are expected to remain unchanged in 2015 (United Nations Educational, Scientific, and Cultural Organization [UNESCO], 2004, 2005). The factors responsible for illiteracy or insufficient are numerous and complex. They include limited access to schooling (e.g., in developing countries) and inadequate preparation for reading instruction (e.g., in disadvantaged areas; Magnuson, Meyers, Ruhm, & Waldfogel, 2004). Recent surveys rank amongst top five industrialized countries around world for its high rate. Yet 2003 survey results indicate that skills of 40% of Canadian adults (ages 16 to 65) fall below level that is considered necessary for an entry-level job in modern and economy (Statistics Canada, 2004, 2005). The consequences of illiteracy or low skills are broad ranging: They include lower school achievement (e.g., persistence, competence), poorer physical and mental health (e.g., life expectancy), and lower employability and work productivity. Several national and international organisations have urged decision makers to take action to foster development for all. The Canadian Council on Learning (2007) emphasized that Canada cannot afford to be complacent about literacy (p. 121) as there are still significant challenges to be addressed. Because nearly all countries around world face similar challenges, United Nations Educational, Scientific and Cultural Organisation (2002) has called period of 2003 to 2012 Literacy Decade. The practise of equating with alphabetization is now viewed as inadequate to address illiteracy as a sociopolitical problem that affects lifelong learning, personal and cultural identity, citizenship, equality of opportunities, governance, and civil society. A broader perspective has led to increasingly encompassing definitions of term literacy. For instance, UNESCO experts now define as the ability to identify, understand, interpret, create, communicate and compute, using printed and written materials associated with varying contexts. Literacy involves a continuum of learning in enabling individuals to achieve their goals, to develop their knowledge and potential, and to participate fully in their community and wider society (UNESCO, 2004, p. 13). In an attempt to reconcile different perspectives, UNESCO experts broke down concept of into four facets. First, can be viewed as set of cognitive skills that are necessary to read and write. …