"in a organization, jobs (and departments) are specialized and grouped as production, marketing, human resources, research and development, finance, accounting, and so forth based on the skills they require."

The complete sentence should be: " In a FUNCTIONAL organization, jobs (and departments) are specialized and grouped as production, marketing, human resources, research and development, finance, accounting, and so forth based on the skills they require. "

Explanation:

functional organization, jobs (and departments) are specialized and grouped according to business functions and the skills they require: production, marketing, human resources, research and development, finance, accounting, and so forth.

In order for a functional organization to be effective in time, jobs and departments are classified among groups and trained depending upon their skills and each specificate business functions they should perform. This process may include several stages, such as: research and development, marketing, finance, human resources, production, accounting amidst other phases.

I hope it helps!