Wellbeing The CIW is composed of eight domains, each of which includes eight separate indicators. The research teams identified key indicators representing each domain, which were directly linked to measures known to contribute or detract from wellbeing. Four main criteria were considered for the indicator selection. The first was validity, or the extent to which an indicator was directly correlated to wellbeing as indicated in the literature. Quality was the second criterion, which stated that an indicator must be derived from credible sources and enhance the understanding of a concept. Reliability, or consistency in the measurement of the indicator over the course of several years, was the third criterion. Fourth, feasibility meant that data had to be easily accessible. With these criteria in mind, eight to 14 central indicators were recommended by each team to represent their specific domain. For a positive indicator, an increase in numerical value meant an increase in that aspect of wellbeing; for a negative indicator, an increase in numerical value reflected a decrease in terms of wellbeing. Ultimately, the number of indicators was limited to eight per domain, for a total of 64 indicators representing the overall composite index of the CIW. Having selected the indicators, data were compiled for the years from 1994 onwards to establish longitudinal trends for each indicator and to prepare for consolidation into a composite index for each domain. The base year, 1994, was chosen to track the wellbeing of Canadians since the National Population Health Surveys were initiated in that year and were the source from which most of the health statistics were obtained. Even though the first CIW report was released in 2011, the selection of 2008 as the final review year for this release was based on the data availability for most of the headline indicators. The subsequent update in 2012 used data available up to and including 2010 for the same reason. Each of the domain reports and composite index report were peer reviewed by three Canadian and two international scholars before being released. The domains of the CIW are as follows: Community Vitality Democratic Engagement Education Environment Healthy Populations Leisure and Culture Living Standards Time Use Data sources The CIW is dependent upon regularly updated, credible, and reliable data to ensure it accurately reflects the wellbeing of Canadians. Statistics Canada surveys are the main source of data for the CIW. Data are drawn from various