“…An assessment tool is adopted and developed by the researcher to assess self-care practices of secondary school students with type 1 diabetes mellitus. The complete instrument of the study consists of ( 3 This part consist of five domains , including insulin administration, which measures through (7) items, reflects evidence that those patients follow administration of insulin that help them to maintain the management of their diabetes, blood glucose monitoring, which consist of (7) questions that clarify adherence patient's about monitor blood glucose level to continue management, diet, This assesses through (5) items, provides evidence that those individuals practice eating habits that support their ongoing diabetes control, exercise, composed of (5) questions measuring physical activity and other activities linked to physical fitness, and follow up with doctor, which measures by (2) questions .…”