Hello, I'm very new to Haskell and I'm learning it in my spare time (ie. just for fun ;) ). I already had a quick look through tutorials, some articles, the Wiki, ... My question is: is there some (simple?) rule/criteria to ensure leazy evaluation will be efficient ? Typically, I process a list and I know each list item can be processed as it come. But I'm not sure my code uses correctly this property ! Is there some way to be sure leazy evaluation is correctly used by my code ? And are there coding rules that will "ensure" correct leazy evaluation ? Thanks, Pierre -- Pierre Barbier de Reuille INRA - UMR Cirad/Inra/Cnrs/Univ.MontpellierII AMAP Botanique et Bio-informatique de l'Architecture des Plantes TA40/PSII, Boulevard de la Lironde 34398 MONTPELLIER CEDEX 5, France tel : (33) 4 67 61 65 77 fax : (33) 4 67 61 56 68