The purpose of this prospective single center study is to investigate if a developed program is more accurate than the anesthesia tape ("Anästhesie-Lineal"). For this study 1000 patients are required to collect anonymized data (length, weight, age, anesthesia material used during anesthesia) for achieving a power of 80% during statistical analysis. The main hypothesis ist that the program has a better accuracy than the anesthesia tape ("Anästhesie-Lineal").