The LAMP research is designed to evaluate chemical and biological response to liming in three different drainage lakes in the Adirondacks. The three lakes vary in size, residence time, chemical composition, and biological community composition, encompassing the range of lakes considered in an operational lake liming program. This ecological experiment provides data for use in evaluating specific questions about liming effects on lake ecosystems; namely, fish and other biotic responses to liming, the effects of liming on acidic impulses during spring runoff, and questions related to metal availability and to modeling of pH and ANC. This paper provides an overview of LAMP, describes the liming of Cranberry Pond and Woods Lake in May 1985, and introduces more detailed papers in this symposium by Drisooll et al., Gloss et al., and DePinto et al. that describe the chemical and biological effects of liming and the ability to predict reacidification. Overall, these initial results of LAMP support the thesis that liming is beneficial to acidic lake ecosystems.