I am not talking about Quests only, I am talking about Mob's A.I. and attributes too (HP, mana, their resistances, armor, their minumum and maximum damage, their attack speed and attack power, their equipment, repuation, loot table and drop rates (so important and so widespread bug on private servers), their position if they are not moving, their patrol route if they are moving, artificial intelligence, their abilities, spells, buffs, debuffes and how do they cast them, when do they cast them, running out or not for help when they are low on health, stop following me or contiune to follow me when I jump into a water running away from mob etc..)
That's why I purpose to do ZONE BY ZONE testing sessions. Here is my advice:
I have one simple suggestion that would take some time but the blizzlike resultes would be there for certian

. I don't know your schedule for testing sessions but I think that zone by zone tactic would be good because it would give us slow but in-depth research what is bugged and what should be fixed (broken quests, quests that work but should be polished, add missing quests, regular quests, class quests, escort quests, elite and group quests, mobs (+ rare/elite mobs) and all their immunites, ressistances, reputation, aggro range, hp & mana, spells and abilites and when do they cast them and how do they cast them, when they are low on health to run for aid, armor, equipment, min & max damage, attack power, attack speed, loot table, drop rates, their buffes and debuffes, their interruption spells, their positioning, their patrol route if they are moving, their gossips etc...)
For example you make 1st session just for starting zones 1-10 level:
Elwynn Forest, Dun Morogh, Teldrassil, Durotar, Mulgore, Trisfal Glades
After everything is tested and players report bugs and you fix them, then you release next 2nd session for zones that are in range 10-20/25/27 level:
Darkshore, Loch Modan, Silverpine Forest, Westfall, Barrens, Redrige Mountains, Stonetalon Mountains
Again after everything is tested and players report bugs and you fix them, then you release next 3th session for zones that are in range 18-35 level:
Ashenvale, Duskwood, Hillsbrad Foothills, Wetlands, Thousand Needles
And you repeat this process until you check and fix all other zones.
Of course you can change range level and increase/decrease zones that you will test in one session but this should be just one simple example of my suggestion.
Good luck
