Swords have been made of many different materials over the centuries and with a variety of tools and techniques. While there are many criteria for evaluating a sword, generally the three key criteria are hardness, strength and balance.
A good sword has to be hard enough to hold an edge along a length which can range from 18 inches (45 cm) to more than 36 inches (90 cm) and at the same time it must be strong enough and flexible enough that it can absorb massive shocks at just about any point along its length and not crack or break. Finally it should be balanced along its length so that it can be easily wielded, although many functional swords are purposefully unbalanced. Balance has a great deal to do with preference and is not a necessary standard.
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