What is software?

Somebody ask me recently how software is defined and i found from my perspective a quite simple definition. The ISO Standard 9000 product term definition (in note 1) explains what products are:

• software (SW) 
• hardware (HW) 
• service 
• processed material 

So if you apply the method of elimination, it is quite simple to define SW:

Software is everything what is not hardware, not service or not processed material

All those four concepts are derived (skos:narrower) from product, feel free and put this in your ontology :)

CU

Stephan