Multiply the length and width of the tile to determine its area. For example, a 4-inch by 4-inch tile is 16 square inches. Divide the area of one tile -- in square inches -- into the total you just calculated to determine the number of tiles you need.
Requirements management. Requirements management is the process of documenting, analyzing, tracing, prioritizing and agreeing on requirements and then controlling change and communicating to relevant stakeholders. It is a continuous process throughout a project. A requirement is a capability to which a project outcome should conform.
The most fundamental aspect of requirements management is the need to communicate effectively. If one stakeholder alters a requirement in some way, the project manager needs to identify how that change is going to impact the requirements of others involved in the project and communicate those changes to them.