Dear All,I have 2 problems.1. Please somebody can help me to do a cascade in Epidata?My database have 4 levels (Region, District, Health Aeria and Village). I want to make a cascade model. So, when i select one region, i want to only have the district linked to the r?gion. The same for district and health aeria and village.2. How to have results with addition of some fields (Integer). In this Epidata version, we can calculate hours and concatenate. Best Regards?_______________________________________Konan Diby JP, MD, MPH Attaché de Recherche Labo. Biostatistique & Informatique Médicale UFR Sciences Médicale, Univ. F. Houphouët-Boigny 22 BP 1041 Abidjan 22, Côte d'Ivoire Tel./Fax: (+225) 22 401 403 GSM: (+225) 05 994 326 / 07 250 561 skype's: dibykonanjp