From The Urban Dead Wiki
A survivor (or human) is any character that is not a zombie. Survivors include civilians trapped in the city, military forces sent to enforce the evacuation, and scientists studying or supporting the effort.
Survivors spend variable (75-150) Experience Points (abbreviated XP) to purchase skills, depending on which starting character class they chose. Survivors begin more mobile than zombies, expending only 1 action point (abbreviated AP) to move into an adjacent block compared to 2 AP per block moved for zombie characters. However, this difference is negated once a given zombie acquires the Lurching Gait skill (thereby taking only 1 AP to move). Survivors possess no effective natural weaponry and thus are reliant on man-made weapons to inflict damage. Some characters choose Melee Weapons (the most popular and effective being the Fire Axe) to avoid the necessity of searching for and reloading ammunition. Other survivors choose to primarily use Firearms. While firearms require additional preparation, they do more damage and have better accuracy than melee weapons for a survivor with all available combat skills.
As a survivor, combat is not the only path to gaining experience and helping quell the zombie onslaught. Many survivors follow a non-combat path, electing to revive the undead or focus on First Aid. Given that reviving slain survivors is both difficult and costly, survivors generally defend themselves and their comrades through the construction of barricades. Higher level survivors often alternate performing all of the above functions.
Some players refer to survivors as "humans", although the game itself does not. The Zamgrh word for survivors is harmanz, or sometimes bra!nz.
It is important to note that survivors usually outnumber zombies as can be seen on stats page. There are several theories regarding the perceived Survivor-Zombie Imbalance. An important factor is that new players choose to play as survivors at a much higher rate than zombies; they choose to recreate the gun wielding glory of their favorite horror movie hero rather than the brain-munching gore brought on by the masses of zombie hordes.
Basic Survivor Tactics
Over the years spent traversing Malton's suburbs, survivors have come up with tactics so as not to get eaten as often; other strategies often cover how experience can be gained in the most AP-effective manner.
Survivors gain experience in many ways, these include (but are not limited to):
Survivors need to stay alive. If they don't, they will be killed and turn into Zombies. To protect themselves, and others around them they take many measures, following a now ubiquitous tactic summarised in the phrase "Cade, Kill, Dump, Heal.":
Survivors will often create groups to co-ordinate their efforts. These tend to be small and focus on moderate objectives such as reclaiming key buildings, though they are much more numerous than zombie groups.
There are three main types of groups in Urban Dead for survivors:
The most numerous group are Territorial groups, as they need little co-ordination and a handful of members to function, whereas the others require people to be in communication and a larger group to function as well.