Define the four career categories in an organisation?

The four career categories in an organization are:

Learners: Individuals with high potential for advancement who are performing below standard (e.g., a new trainee).

Stars: Individuals presently doing outstanding work and having a full potential for continued advancement; these people are on fast-track career paths.

Solid Citizens: Individuals whose present performance is satisfactory but whose chance for future advancement is small. These people make up the bulk of the employees in most organizations.

Deadwood: Individuals whose present performance has fallen to an unsatisfactory level; they have little potential for advancement.

(info from Human Resource Management, 9th Ed, Byars & Rue, published by McGraw-Hill Irwin)