There are many teaching methods with different means and aids. Correcting mistakes is one of these teaching methods and educationalists call is the "remedial method." Correcting people's mistakes is essential if teaching people is the aim. Correcting mistakes is a divine method the Prophet (pbuh) practiced as the Qur'an was sometimes revealed to correct some mistakes of the Sahabah (companions of the Prophet).
The Prophet (pbuh) was divinely guided in correcting the mistakes of people. So his methods are the best mankind has ever known. Following the example of the Prophet (pbuh) is therefore the best approach if one is really keen to teach Islamic knowledge and all the other branches of knowledge.
The author has in this book compiled many methods of the Prophet (pbuh) for teaching people and correcting their mistakes. This book, as such, is indispensable for everyone who is concerned with education in general, and Islamic knowledge in particular.