The research aims to identify Composite Leading Indexes (CLIs) and develops the Early Warning System (EWS) by Partial Least Squares Structural Equation Modeling (PLS-SEM). The objective of EWS is to forecast the Economic Cycle (EC) in short-term, medium-term, and long-term periods. Data from Thailand during Q1/2003-Q4/2008 are applied to pursue the purposes. The research uses Real Gross Domestic Product (GDP) as a proxy for the Thai economy, which is the target variable that EWS aims to early signal. The indicators from various economic sectors ...