Being able to use similar things on different software e.g using doccument saved as windows 2003 in windows 2007
Capability of serving a purpose well and has all the features needed
the speed, RAM and hardware space required
reputation of manufacturer
Process or manner of functioning or operating (speed in which it works)
Reliability and whether or not it crashes and how often
Will it work with the current version of Microsoft Windows that you have?
Layout of screen (cluttered? clear?)
Use of software that is yours and what someone else has e.g. can you look at files others send you?
Formal measurements that are used as guides to the level of usability of a product (EX: dwell time, error rates, efficiency) and how easy it is to use
Is there support available? How often? When? Do you have to pay?