Maria Tecla Artemisia Montessori ( August 31, 1870 – May 6, 1952) was an Italian physician and educator best known for the philosophy of education that bears her name, and her writing on scientific pedagogy. Her educational method is in use today in some public and private schools throughout the world.

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In 1906 Montessori was invited to oversee the care and education of a group of children of working parents in a new apartment building for low-income families in the San Lorenzo district in Rome. Montessori was interested in applying her work and methods to mentally normal children, and she accepted. The name Casa dei Bambini, or Children's House, was suggested to Montessori, and the first Casa opened on January 6, 1907, enrolling 50 or 60 children between the ages of two or three and six or seven.

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At first, the classroom was equipped with a teacher's table and blackboard, a stove, small chairs, armchairs, and group tables for the children, and a locked cabinet for the materials that Montessori had developed at the Orthophrenic School. Activities for the children included personal care such as dressing and undressing, care of the environment such as dusting and sweeping, and caring for the garden. The children were also shown the use of the materials Montessori had developed.Montessori herself, occupied with teaching, research, and other professional activities, oversaw and observed the classroom work, but did not teach the children directly. Day-to-day teaching and care were provided, under Montessori's guidance, by the building porter's daughter.

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In this first classroom, Montessori observed behaviors in these young children which formed the foundation of her educational method. She noted episodes of deep attention and concentration, multiple repetitions of activity, and a sensitivity to order in the environment. Given free choice of activity, the children showed more interest in practical activities and Montessori's materials than in toys provided for them, and were surprisingly unmotivated by sweets and other rewards. Over time, she saw a spontaneous self-discipline emerge.

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Based on her observations, Montessori implemented a number of practices that became hallmarks of her educational philosophy and method. She replaced the heavy furniture with child-sized tables and chairs light enough for the children to move, and placed child-sized materials on low, accessible shelves. She expanded the range of practical activities such as sweeping and personal care to include a wide variety of exercises for care of the environment and the self, including flower arranging, hand washing, gymnastics, care of pets, and cooking. She also included large open air sections in the classroom encouraging children to come and go as they please in the room's different areas and lessons. In her book she outlines a typical winter's day of lessons, starting at 09:00 AM and finishing at 04:00 PM.

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She felt by working independently children could reach new levels of autonomy and become self-motivated to reach new levels of understanding. Montessori also came to believe that acknowledging all children as individuals and treating them as such would yield better learning and fulfilled potential in each particular child.She continued to adapt and refine the materials she had developed earlier, altering or removing exercises which were chosen less frequently by the children. Also based on her observations, Montessori experimented with allowing children free choice of the materials, uninterrupted work, and freedom of movement and activity within the limits set by the environment. She began to see independence as the aim of education, and the role of the teacher as an observer and director of children's innate psychological development.