1. A computer-implemented method for assigning a trust attribute to a design portion of a design, the method comprising: obtaining the design portion, the design portion: including one or more design details in the design, a design detail specifying one or more aspects or elements of the design, and being a portion of an executable graphical model of a dynamic system provided in a modeling environment, the graphical model being executable by a computer to simulate a behavior of the dynamic system; assigning to the design portion a trust attribute that contains a description of a quality of the design portion, and applying a stamp of certification to the design portion with the trust attribute to demonstrate that the design portion is certified.