Erection: establishment or advancement; noun of action from erect- Meaning "the putting up" (of a building, etc.); upright in position or posture; to stand or sit erect; raised or directed upward etc.
Construction: is a process that consists of the building or assembling of infrastructure.
Commissioning: the process of assuring that all systems and components of a building or industrial plant are designed, installed, tested, operated, and maintained according to the operational requirements of the owner or final client.

Metal Fabrication is the forming of metal, usually steel plate, into various forms either by welding or other forms of metal joining processes. Metal fabrication falls into two categories, either "light" (metals under 3mm thick) or "heavy" fabrication.

Purchasing refers to a business or organization attempting to acquire goods or services to accomplish the goals of its enterprise. Though there are several organizations that attempt to set standards in the purchasing process, processes can vary greatly between organizations.

When most people talk about detailed design, they are referring to a process known as top-down design. In short, when you think about the problem you are trying to solve, you start at the highest level and then work yourself into the details. This approach works very well when you have an overall structure you want your application to live within. At the macro level you are considering how many machines will be needed to host your application, which existing services you will need to use, etc. As you dive deeper, you are looking at use cases (or user stories if you prefer that terminology), and error handling (use cases have both normal and error condition paths to worry about). As you go even further into the details, you are looking at your algorithm, state transitions, logical sequence, and how internal parts of the code work together.

The principles of design describe the ways that artists use the elements of art in a work of art. Balance is the distribution of the visual weight of objects, colors, texture, and space. If the design was a scale, these elements should be balanced to make a design feel stable.

As the name implies, a feasibility study is an analysis of the viability of an idea. The feasibility study focuses on helping answer the essential question of “should we proceed with the proposed project idea?” All activities of the study are directed toward helping answer this question.