Usability is the ease of use and learnability of a human-made object.
The ability to remain functional, without requiring excessive maintenance or repair, when faced with the challenges of normal operation over its design lifetime.
The ease with which a product can be maintained in order to; correct defects or their cause, repair or replace faulty or worn-out components without having to replace still working parts, prevent unexpected working condition, maximize a product’s useful life, maximize efficiency, reliability, and safety, meet new requirements, make future maintenance easier, or cope with a changed environment.
Designed at the outset for rapid change in structure, hardware and software components, in order to quickly adjust capability and function within a fleet in response to sudden environmental changes or varying demands.
The capability of a whole-system design to support operational use and readiness needs throughout the life-cycle at an affordable cost.
The ability to operate over extended ranges and conditions whilst resisting environmental effects during sustained operation.
The ability to couple with standard towable loads and provide tractive effort to move them safely and securely over distance and terrain.
The ability to carry heavy loads safely and efficiently, including adequate load carrying space, restraints and handling provision.
The ability to manoeuvre over soft terrain under load without excessive damage to the surface and without losing tractive effect.
A vehicle that is a means of transport, viable on land as well as on water.
The ability to overcome natural, man-made and concealed obstacles to movement.
The ability to move quickly over terrain.
The ability to make precise control movements that result in vehicle movement that precisely reflect the operators intention.
The ease with which a vehicle is able to move and change direction, in this case over difficult terrain.
In the context of an extreme terrain vehicle, having a low and central Centre of Gravity in a wide footprint so as to resist tipping on ground and to remain stable when afloat.
The ability to overcome rapid changes in gradient or ground level without losing traction, bottoming out, fouling extremes of the vehicle or turning over.
The ability to move across a slop safely without slipping or overturning, whilst retaining the ability to manoeuvre and deal with or avoid obstacles or changing ground conditions.
The ability to ascend or descend steep slopes safely, without losing traction, retaining the ability to manoeuvre to avoid obstacles or changing ground conditions, including the ability to back off safely and under control if necessary.
The ability to deal rapidly and effectively with any form of terrain challenge, and to adapt quickly to changing operational demands. A complex emergent capability.