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1. The Nolan Model Stages:
Stage 1: Initiation
The first growth stage is known as initiation stage. During this
stage, information technology is introduced into the
organization. The organization buys and installs computer
systems, and few applications are computerized to meet the
basic organizational needs.
Stage 2: Contagion
This stage is also known as expansion stage. This is the phase
when most of the organizations wish to have an access to the
computer hardware, develop software and have the trained
manpower working.
Stage 3: Control
This stage is also known as formalism stage. During this stage,
management notices that benefits derived from MIS activity
are not in proportion to the actual expenditure spent on it.

2. Stage 4: Integration
This stage is also known as maturity stage. By this stage,
organizations gain enough experience and maturity in IS
applications.
Stage 5: Data administration
This stage puts emphasis on managing corporate data rather
than IT. So, management of data becomes the crucial step at
this stage. it is the responsibility of DBA to plan, supervise,
control and secure the data.
Stage 6: Maturity
This is the final stage of enhanced Nolan model. It shows that
application portfolio (tasks like orderly entry, material
requirements planning, etc.) is completed and hence
information flows within an organization.