Many recipes call for the addition of small amounts of ingredients, usually measured in teaspoons (5 ml) and tablespoons (15 ml). However, as teaspoon and tablespoon sizes can vary enormously, simply using a spoon from your cutlery drawer isn't generally a good idea. Whilst this may not make too much of a difference in some dishes, the precise amount of yeast or baking powder is crucial for cake or bread recipes. It is generally assumed that a measure will be level unless the recipe specifies otherwise.