In the most material , constant yielding will not occur beyond the elastic range. Actually , this material often does not have a welled-defined yield point , and consequencely it is standard practice to defined a yield strength using a graphical procedure called the Offset Method. Normally a 0.2% strain (0.002in/in) is chosen and from this point on the axis , a line parallel to the initial straight line – portion of the stress-strain diagram is drawn. The point where this line intersect the curve defined the yield strength.