Skala merupakan suatu prosedur pemberian angka atau simbol lain kepada sejumlah ciri dari suatu obyek agar dapat menyatakan karakteristik angka pada ciri tersebut (Umar, 2003).
The scale is a procedure of granting the numbers or other symbols to a number of characteristics of an object so that it can declare the characteristics of numbers on the characteristics (Umar, 2003).
Scale is a procedure giving numbers or other symbols to a number of characteristics of an object in order to express the characteristics of the numbers on these characteristics (Umar, 2003).