The general characteristics for the star rating scale are as follows:
1 star * The text is of bad quality, and has severe accuracy, fluency and style problems and does not convey the meaning of the source text
2 stars ** The translated text is of poor quality, and has major problems that may affect the accuracy, fluency and/or style, making it difficult to read
3 stars *** The translated text is of fair quality, but contains some issues that particularly affect its fluency, causing the text to sound unnatural
4 stars **** The translated text is of good quality. It is accurate and fluent, containing only minor errors that do not have much impact on the comprehension of the text
5 stars ***** The translated text is perfect, with none or very few errors (e.g. an extra whitespace or a small spelling mistake)
If you want to know more about how our evaluators rate tasks, you can read more about this here.