Client/server computing has arisen because of a change in business
needs.  Businesses today need integrated, flexible, responsive and
comprehensive applications to support the complete range of business
processes.

Problems with existing systems include: 
- applications were developed to model vertical applications 
- applications were built in isolation 
- applications were implemented as monolithic systems 
- applications were complex 
- the supporting technology was based on a centralised control model

Information technology, which is an enabling factor in systems
building, has almost reached the stage where these systems can be
designed and created. Unfortunately, most businesses have existing
systems based on older technology, which must be incorporated into the
new, integrated environment.

The development and implementation of client/server computing is more
complex, more difficult and more expensive than traditional, single
process applications. The only answer to the question "why build
client/server applications?" is "because the business demands the
increased benefits.