The transfer length is the distance required to transfer the force in the strand, under service loads, from a value of 0% at the end of the beam (or end of debonding, if present) to 100% of its capacity. For locations within this region, a linear interpolation is performed to compute the effective area of steel. The transfer length is computed as 50 times diameter of strands as specified in clause 8.9.1.8. The development length is the distance required to develop the full capacity of the strand and is used for ultimate capacity calculations under factored loads. Since the stress under factored loads is higher, the development length is longer than the transfer length.