This colour coded "Noorani Qaidah" is for teaching children and reverts how to recite the Holy Qur'an, beginning from single alphabets then short words, phrases and the complete verses.
This particular version contains detailed directions in Urdu & English. While the rules of Tajweed (the proper way of reciting the Qur'an) are differentiated through different colours. So that, these rules may become easy for the beginners to follow and understand them completely.