Companies that buy AIS software follow the normal systems development life cycle (SDLC) except for the following.

a. During conceptual systems design, companies determine whether software that meets AIS requirements is available and, if so, whether to buy it or create their own.

b. Some physical design, implementation, and conversion steps can be omitted. For example, the company usually does not need to design, code, and test program modules or document the computer program.

c. Both of the above apply.