The Construction economic sector produces homes, offices, towers, infrastructure and other structures. It usually follows a process of initiative, design, construction and commissioning. For metropolitan development, parties often work in partnerships or consortia to win a contract. They then consist of two or more companies that are sometimes also located in other countries. That group then gives the assignment to the executing party, which often also hires other companies for specialist work. Below is a selection of the available construction aerial photos. More available aerial photos with construction projects can be found via zoeken beeldbank.