iRubric: Making a Peanut Butter and Jelly Sandwich rubric

Only one knife was used and there is either jelly in the peanut butter jar or peanut butter in the jelly jar.

Only one knife was used while making the sandwhich, but there is no jelly in the peanut butter jar or visa versa.

Two separate knives were used to construct the sandwich. There is no peanut butter in the jelly jar and there is not jelly in the peanut butter jar.