The seven-year crisis is a transition from pre-school to school-age thinking. Child begins to reason logically, understand cause and effect and see themselves through others' eyes.
For the first time, 'inner life' appears — thoughts, feelings, secrets not shared with adults. This is healthy, even if it surprises parents.
Daniel J. Siegel: 'At age 7, the first serious integration of left and right hemispheres occurs' — child begins to combine logic and emotion. The process is uncomfortable and visible.
Social hierarchy becomes critically important. 'What will my classmates think?' is a new dominant motivation. Correctly directed, this develops social intelligence.