Most of the rules of the Islamic Practical Laws have always remained unchanged. The Mujtahids, although because of the requirement of the system of Ejtihad have to analyze and carefully examine the basis of every single rule, reach the same decision about most of the rules of the Islamic Practical Laws. For this reason, most of the rules in this book coincide the 'Fatwas' (a Mujtahid's view of an Islamic rule), of all the Mujtahids. Only a small percentage of the rules, most based on precautionary measures, may not remain the same to all Mujtahids. Such rules in this book coincide the 'Fatwas' of Ayatullah Sayyid Abul-Qasim Al-Koei of Najaf Al-shraf Iraq.
