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.
Cornerstone
In the Eastern Orthodox Church the blessing of the bishop must be obtained before construction on a new church may commence, and any clergyman who ventures to do so without a blessing can be deposed. The "Rite of the Foundation of a Church" (i.e., the laying of the cornerstone) will differ slightly depending on whether the church is to be constructed of wood or of stone. Even when a church is built of wood, the cornerstone must in fact be made of stone.