Private corporations often require written confidentiality agreements and conduct background checks on candidates for sensitive positions.  In the . the Employee Polygraph Protection Act prohibits private employers from requiring lie detector tests, but there are a few exceptions. Policies dictating methods for marking and safeguarding company-sensitive information (. "IBM Confidential") are common and some companies have more than one level. Such information is protected under trade secret laws. New product development teams are often sequestered and forbidden to share information about their efforts with un-cleared fellow employees, the original Apple Macintosh project being a famous example. Other activities, such as mergers and financial report preparation generally involve similar restrictions. However, corporate security generally lacks the elaborate hierarchical clearance and sensitivity structures and the harsh criminal sanctions that give government classification systems their particular tone.
This industry is engaged in the creation of infra-structure for smooth development of the economy. It is concerned with the construction, erection or fabrication of products. These industries are engaged in the construction of buildings, roads, dams, bridges, and canals. These industries use the products of other industries such as cement, iron, bricks and wood, etc. Engineering and architectural skills play an important part in construction industry. Engineering and constructing firms are organised for undertaking operations of construction industry.