Survivability is the ability to remain alive or continue to exist. The term has more specific meaning in certain contexts.
In engineering, survivability is the quantified ability of a system, subsystem, equipment, process, or procedure to continue to function during and after a natural or man-made disturbance; e.g. nuclear electromagnetic pulse from the detonation of a nuclear weapon.
For a given application, survivability must be qualified by specifying the range of conditions over which the entity will survive, the minimum acceptable level or post-disturbance functionality, and the maximum acceptable outage duration.
 Military Survivability
In the military environment Survivability is defined as the ability to remain mission capable after a single engagement. Survivability comprises three elements:
- Susceptibility - the likelihood of being detected, identified, and hit
- Vulnerability - the effects of being hit by a weapon
- Recoverability - longer term post hit effects, damage control and firefighting, capabiltiy restoration or (in extremis) escape and evacuation.
The European Survivability Workshop introduced the concept of "Mission Survivability" whilst retaining the three core areas above, either pertaining to the "survivability" of a platform through a complete mission, or the "survivability" of the mission itself (i.e. probability of mission success). Recent studies have also introduced the concept of "Force Survivability" which relates to the ability of a force rather than an individual platform to remain "mission capable".
There is no clear prioritisation of the three elements; this will depend on the characteristics and role of the platform. Some platform types, such as submarines, minimise their susceptibility and may to some extent compromise in the other areas. Main Battle Tanks minimise vulnerability through the use of heavy armours. Surface warship designs tend to aim for a balanced combination of all three areas.
Survivability denotes the ability of a ship and its onboard systems to remain functional and continue designated mission in a man-made hostile environment. The naval vessels are designed to operate in a man made hostile environment, and therefore the survivability is a vital feature required from them. The naval vesselâs survivability is a complicated subject affecting the whole life cycle of the vessel, and should be considered from the initial design phase of every war ship.
The classical definition of naval survivability includes three main aspects which are susceptibility, vulnerability, and recoverability, although recoverability is often subsumed within vulnerability. Susceptibility consists of all the factors that expose the ship to the weapons effects in a combat environment. These factors in general are the operating conditions, the threat and the features of the ship itself. The operating conditions, such as sea state, weather and atmospheric conditions, vary considerably and their influence is difficult to address (hence they are often not accounted for in survivability assessment). The threat is dependent on the weapons directed against the ship and weaponâs performance, such as the range. The features of the ship in this sense include platform signatures (radar, infrared, acoustic, magnetic), the defensive systems on board such as surface to air missiles, EW and decoys, and also the tactics employed by the platform in countering the attack (aspects such as speed, manoeuvrability, chosen aspect presented to the threat). Vulnerability refers to the ability of the vessel to withstand the short term effects of the threat weapon. Vulnerability is an attribute typical to the vessel and therefore heavily affected by the vesselâs basic characteristics such as size, subdivision, armouring and other hardening feartures, and also the design of the ship's systems, in particular the location of equipments, degrees of redundancy and separation and the presence within a system of single point failures. Recoverability refers to vesselâs ability to restore and maintain its functionality after sustaining damage. Thus recoverability is dependent on the actions aimed to neutralize the effects of the damage. These actions include fire fighting, limiting the extent of flooding and dewatering. It shall be noted that besides the equipment also the crew has a vital role in recoverability.
 Combat Vehicle Crew Survivability
The crews of military combat vehicles face numerous lethal hazards which are both diverse and constantly evolving. Improvised Explosive Devices, (IEDs), mines and enemy fire are examples of such persistent and variable threats. Historically, measures taken to mitigate these hazards were concerned with protecting the vehicle itself, but due to this achieving only limited protection the focus has now shifted to safeguarding the crew within from an ever-broadening range of threats, including Radio Controlled IEDs (RCIEDs), blast, fragmentation, heat stress and dehydration.
The expressed goal of âcrew survivabilityâ is to ensure vehicle occupants are best protected. It goes beyond simply ensuring crew have the appropriate protective equipment and has expanded to include measuring the overpressure and blunt impact forces experienced by a vehicle from real blast incidents in order to develop medical treatment and improve overall crew survivability. Sustainable crew survivability is dependent on the effective integration of knowledge, training and equipment:
 Prevention & Training
Threat Intelligence identifying trends, emerging technologies and attack tactics used by enemy forces enables crews to implement procedures that will reduce their exposure to unnecessary risks. Such intelligence also allows for more effective pre-deployment training programs where personnel can be taught the most up-to-date developments in IED concealment for example, or undertake tailored training that will enable them to identify the likely attack strategy of enemy forces. In addition, with expert, current threat intelligence the most effective equipment can be procured or rapidly developed in support of operations.
"The capability of a system to fulfill its mission, in a timely manner, in the presence of threats such as attacks or large-scale natural disasters. Survivability is a subset of resilience."
âThe capability of a system to fulfill its mission, in a timely manner, in the presence of attacks, failures, or accidents.â
 See also
- ^ This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).
- ^ Said, M., Theory and Practice of Total Ship Survivability for Ship Design. Naval Engineers Journal, 107(1995)4, p. 191-203.
- ^ a b Kotiranta, R., The Assessment of Naval Vesselâs Survivability against Explosion in Air based on a 3-D Product Model, 2006, p. 1
- ^ Reese, R. et al., Operationally Oriented Vulnerability Requirements in the Ship Design Process. Naval Engineers Journal, 110(1998)1, p. 19-34.
- ^ Lake, J., Warship Survivability. Conference Proceedings of International Naval Technology Expo 80, Geneve, Sveitsi 1980, p. 28-50.
- ^ The ResiliNets Research Initiative definition of survivability.
- ^ Abdul Jabbar Mohammad, David Hutchison, and James P.G. Sterbenz "Poster: Towards Quantifying Metrics for Resilient and Survivable Networks", 14th IEEE International Conference on Network Protocols (ICNP 2006), Santa Barbara, California, USA, November 2006
- ^ R. J. Ellison, D. A. Fisher, R. C. Linger, H. F. Lipson, T. Longstaff, N. R. Mead, Survivable Network Systems: An Emerging Discipline, Carnegie-Mellon Software Engineering Institute Technical Report CMU/SEI-97-TR-013, 1997 revised 1999
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