The goal of this test is to see how much time it is needed for one keystroke of a number on the keyboard. By random principle the program displays a number made of three whole digits and one or two decimals separated by comma. Upon starting the test program displays the first number. When the user finishes pressing all number keys (and a comma that separates whole from decimal digits), user has to press Enter so the next number can be displayed. The process is repeated for 5 different numbers. In addition, the number of errors per ten typed numbers entered for each user is counted. The Damerau–Levenshtein algorithm is used to calculate the number of errors. The Damerau–Levenshtein distance between two words is the minimum number of operations (consisting of insertions, deletions or substitutions of a single character, or transposition two adjacent characters) required to change one word into the other. Since this number is usually too small, we counted the number of errors per 10 typed numbers.