Analytical views and the precise statistics are very important for the engineers. First, the architects try to satisfy the needs and the wishes of the owners and design the projects. Afterwards, the engineers should make analysis and see how to make the project into reality. Normally, very part of the houses or the buildings is important and can make a difference in the quality and the safety. Therefore, for example the trusses support the roofs or the support bridges or towers. They are one of the most important engineer structures.