At its most basic, beginner level, the Curly Girl Method involves cutting out ingredients and products that hurt your curls (like anything drying or harsh), and then adding in things that heal, ...
For more details about the history and classification of EC, refer to the following wonderful books and papers, just to name a few: De Jong, K.A., Fogel, D.B. and Schwefel, H.P., 1997. A history of ...