The U.S. Environmental Protection Agency (U.S. EPA) Office of Resource Conservation and Recovery has initiated the review and validation process for four leaching tests under consideration for inclusion in its analytical chemistry guidance, SW-846.1 These protocols are derived from published leaching methods (Kosson et al. 2002) and international standards in various states of development and validation on wastes (CEN/TS 14405 2004; CEN/TS 14429 2005; CEN/TS 14997 2005; CEN/TS 15863 2009), construction products (CEN/TS-2 2009; CEN/TS-3 2009), and soils (ISO/TS 21268-3 2007; ISO/TS 21268-4 2007; ISO/DIS 12782 parts 1-5 2010) with further collaborative development between Vanderbilt University, the Energy research Centre of the Netherlands (ECN) and DHI in Denmark. The four test methods supported in this document provide the required materials leaching information for the Leaching Environmental Assessment Framework (LEAF). These methods have been used as the basis for evaluation of process variables in the leaching of coal combustion residues (Sanchez et al. 2006; Sanchez et al. 2008; Kosson et al. 2009; Thorneloe et al. 2010); however, broader application of these test methods can be used to estimate constituent leaching from a wide range of solid materials in the context of disposal, beneficial use in construction applications, and evaluation of treatment effectiveness. LEAF is an integrated set of testing methods, data management and visualization tools, and report support utilities that can be used to support a wide range of environmental management decisions. Within the framework, testing characterizes the leaching behavior of a material under equilibrium and dynamic conditions through the use of a suite of four broad-based test methods including batch, column and tank tests. The results of these tests may be interpreted individually or integrated to provide characteristic leaching behavior of a solid material over a range of potential release scenarios. The methods are applicable to a wide range of solid materials, including combustion residues, soils, sediments, construction materials, industrial process residues, for estimation of constituent release, with a focus to date on inorganics, in the context of disposal, beneficial use in construction applications, and evaluation of treatment effectiveness, and remediation. Data management, comparison of test results to previously characterized materials and report output support is greatly facilitated by the LeachXS LiteTM expert leaching system software program.