Construction is the process of constructing a building or infrastructure. Construction differs from manufacturing in that manufacturing typically involves mass production of similar items without a designated purchaser, while construction typically takes place on location for a known client. Construction as an industry comprises six to nine percent of the gross domestic product of developed countries. Construction starts with planning, design, and financing; it continues until the project is built and ready for use.
Effective planning is an essential part of the ongoing project management process. The environmental impact of a job, its scheduling, budgeting, site safety, availability and delivery of quality materials, personnel, logistics, as well as inconvenience to the general public, compliance with local and national standards – these things and countless more all have to be considered.