Foundation (engineering)
Foundations are designed to have an adequate load capacity depending on the type of subsoil/rock supporting the foundation by a geotechnical engineer, and the footing itself may be designed structurally by a structural engineer. The primary design concerns are settlement and bearing capacity. When considering settlement, total settlement and differential settlement is normally considered. Differential settlement is when one part of a foundation settles more than another part. This can cause problems to the structure which the foundation is supporting. Expansive clay soils can also cause problems.
Private foundation (United States)
Until 1969, the term "private foundation" was not defined in the United States Internal Revenue Code. Since then, every U.S. charity that qualifies under Section 501(c)(3) of the Internal Revenue Service Code as tax-exempt is a "private foundation" unless it demonstrates to the IRS that it falls into another category. Private foundations in the United States are generally subject to a 1% or 2% excise tax on net investment income. According to the Foundation Center, a private foundation is a nongovernmental, nonprofit organization, which has a principal fund managed by its own trustees or directors. Hopkins (2013) listed four characteristics that make up a private foundation: