In order for children and adults to achieve peace, theories suggest that understanding is required. Few efforts have been made by previous researchers to trace the developmental process and describe the unfolding of that understanding, however. This qualitative study of 58 children ages 3 to 12 used drawings and semi-structured interviews to identify themes in children's descriptions of peace. Those themes and understandings were then divided into 6 levels which were interpreted in light of developmental theories. Some changes in children's thinking appeared to be stage-like, others showed gradual development, and others appeared to be more idiosyncratic. Implications are shared for researchers, including recommendations for methods and analysis. Implications are also offered for parents and caregivers when supporting children's developing ideas about peace. Data Collection • Families with children aged 3 to 12 were recruited through schools and childcare programs, personal contacts, and snowball sampling. • Phase 1: Interviews conducted after the attacks of Sept. 11, 2001 and in 2009 and 2010 during the Iraq and Afghanistan wars. n = 20, 10 boys and 10 girls, mean age = 7.6 • Phase 2: Interviews conducted after the NATO bombings related to the Kosovo crisis in 1999. n = 38, 18 boys and 20 girls, mean age = 7.43 • Children were first asked to draw pictures of war and peace and then were interviewed by a trained graduate student or professor using a semi-structured interview. Analysis • In the first phase of analysis, we began individually reading through all of the children's answers regarding peace to get a sense of the data, as recommended by Patton (2002), using some of the results of previous studies as sensitizing concepts. • The next step was to arrange the children's answers according their ages. While reading through the children's answers in this order, we used open coding (Patton, 2002) to look for trends and themes related to age. • A developmental progression at six levels was identified. • Using axial coding (Patton, 2002), the themes within each stage were reduced and refined. • In the second phase of analysis, we used the coding categories from the first phase to code the answers of the 38 children in the second group. • This analysis added some themes and was used to confirm and refine the stages.