The toddlers are trying to find a solution to the Moon’s dressmaker problem. He/She can’t take measurements to make her a dress, because her shape changes every day. The little researchers undertake to unravel the mystery and find out what is going on by starting with brainstorming and their previous knowledge, continuing with measurements, observations, experiments, constructions, internet searches and through various actions they get to know the 8 Phases of the Moon. They also evolve their collaboration, communication, creativity and critical thinking skills. The results of the students’ research are compared and matched with the photos from the 8 Phases sent by the Skinakas Observatory.