This study is a gas quasi experimental field trial. which was carried on families of junior high school students in district 9 in Tehran during 1994-95. The objective of this study was to demonstrate the effect of education of students on knowledge. practice attitude of their families regarding iodized salt. https://www.roneverhart.com/Western-Digital-Re-WD6001FSYZ-6TB-7-2K-RPM-SATA-6Gb-s-128MB-3-5-Hard-Drive/