Requirements in the material planning process specify The master data requirements. How the material planning should be executed. The work center capacity. Requirements for the different modes of transportation. How many of the materials are needed and when they are needed.

How many of the materials are needed and when they are needed.

Explanation:

Material requirements planning (MRP) is a system for calculating the materials and components needed to manufacture a product. It consists of three primary steps: taking inventory of the materials and components on hand, identifying which additional ones are needed and then scheduling their production or purchase.

Through adequate materials requirements planning (MRP), the need for manual materials planning is eliminated and the system is able to successfully carry out an efficient strategy.

i believe the answer is: description

description refers to the goal of psychologist to identify the phenomenon that being observed. this goal is being actualized by collecting data/information from various clues that observed through the phenomenon. this goal must be accomplished before pyschologist able to create methods of treatment.