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Glossary

Usability/user testing 

Representative users are 

observed performing representative tasks using a system.

 Use-  case 

The sequence of transactions between an 

actor and a system that supports the activities of the actor.

 Use-  case  modelling 

A   user-  centred  approach  to 

modelling system requirements.

 User-  centred  design 

Design based on optimising the 

user experience according to all factors, including the user 

interface, which affect this.

Utility computing 

IT resources and in particular 

software and hardware are utilised on a  pay-  per-  use basis 

and are managed externally as ‘managed services’.

V

Value chain 

A model for analysis of how supply chain 

activities can add value to products and services delivered 

to the customer.

Value network 

The links between an organisation 

and its strategic and  non-  strategic partners that form its 

external value chain.

Value stream 

The combination of actions required to 

deliver value to the customer as products and services.