The characteristics of timber are required in all the design modes. A standard group of controls is usually used to specify this information. Such characteristics as the wood species (pine, fir, oak, ...), the grade of wood, and the dead weight are selected from the respective lists. The latter parameter is required only in those modes where the load from the self-weight can be specified (e.g., beams or purlins). Moreover, the respective radio buttons are used to indicate whether a section is a glued one.
This group of controls usually contains a list for selecting or entering the importance factor according to GOST 27751-88.