In this book, Professor Mustafa Saeed al-Khen has reviewed Qawaid Usulliyah and has explained in detail the visible effects due to the differences in these Qawaid between Jurists.
A fabulous volume of 11 books on the Fiqh of hadeeth with more than 2000 Ahkaam and Masaail by the great imam of his time Ibn Hazm Al-Undulusi (translated into Urdu)