Montessori Observation System This download includes 4 unique observation cards, sized to fit in a 3x5 index card storage box. The cards include: Basic, One Minute Sampling, Recess, and Full Class. It also includes instructions for setting up a system using index cards, making it easy to jot down observations in the moment AND easy to look over the history for individual students when the need arises. Observation is the most important tool a Montessori guide has in her toolbelt. But it's