Students are expected to have more background questions as they build their personal knowledge base.
As they become more knowledgeable about their field and patient care, they have fewer background questions and have more Foreground questions.
The most complex question is the PICO question, which is used for Informed Decision-Making.
Image from Spoetnic, Laika, Grand Rounds Vol. 6, No. 2. Laika's MedLibLog, https://laikaspoetnik.wordpress.com/2009/09/29/grand-rounds-vol-6-no-2/