A student must know a word relatively well for it to be considered ready for an assessment. This article will explain the metrics we use to consider a word quizzable.
Word Memory Scores
Every word a student sees in training is assigned a memory score from 0 to 100. A word that’s just been studied or drilled is assigned a maximum score of 100. Over time the score decreases, reflecting a gradual decline in the student's memory strength associated with a given word. Correctly answering a drill question on a word increases memory strength. Membean currently expects a word to have a score of at least 70 before it can be considered to be fair content for an assessment. This ensures that words that are weak in the student's memory are not needlessly tested.
Words Recently Introduced to the Student
Can a word that a student has seen recently appear on a quiz? Yes, if it meets the reasonableness criteria. If a new word was just seen and some questions answered shortly before a quiz is issued, the word is a reasonable candidate for a quiz. The expectation is that a diligent student should know this word because he or she just learned it.