What is meant by the horizontal dimensioning of an organization? Also explain the terms ...

 The horizontal dimensioning of an organization refers to the extent to which firms use lateral subdivisions or specialties within an organization. Overall, to build organizations horizontally, organizations establish departments. A department is a unique group of resources established by management to perform some organizational task. Departmentalizing is the process of establishing departments within the management system.
Typically, these departments are based on, or contingent on, such situational factors as the work functions being performed, the product or service being offered, the territory being covered, and the customer being targeted.

Makes more sense now, TY