Material and pervasive

If you use search function on the key words of your query you'll find very similar Qs answered, for example: https://opentuition.com/topic/adverse-opinions/ Pervasive is not a "degree" of material. Re your management rep example - it would depend what management rep you are referring to. If it's the required rep concerning mgt's responsibilities for the financial statements clearly this lack of evidence is pervasive hence disclaimer of opinion. (And why this situation is very very rare in the real world.)