A common way is to analyze the appearance, smell and taste of the beer.
[4] However it is common for professional organisations such as the Wine & Spirit Education Trust to rate beer with verbal grades: faulty - poor - acceptable - good - very good - outstanding, corresponding to a scale from 1 to 5.
[6] Beers are often tasted in an order from lightest to heaviest, driest to sweetest and cheapest to most expensive.
The glass should have a foot so that the container part is not stained or warmed by the hands.
In this type of tasting the taster does not know which beer is in which glass, for example by shrouding the bottle in an opaque container as it is poured.