Knowing the Ma'sumin: Imam Ali al-Ridha (a) is part of the series of workbooks on the Ma'sumin (a). The workbook activities are designed to teach children ages 8-12 years the bigraphical details about the Eighth Imam in the Progeny of Holy Prophets Muhammad sallal-lahu 'alayhi wa-alihi wasallam, the great teachings of Imam al-Ridha 'alayhis-salam, examples from his illustrious life, his Eid prayers, becoming crown-prince to Ma'mun and sayings on commemorating the tragedy of Karbala.