It is unknown whether the structure is designed and constructed to be ductile. The structural components may be hidden, or information about them is unavailable. It is usually not obvious whether a building was designed to perform in a ductile manner, without additional information such as design calculations and construction drawings.

D99_Philippines Manila Scawthorn_1

It is not clear whether this reinforced concrete frame building in Manila, Philippines was designed and constructed to perform in a ductile manner (C. Scawthorn)

D99_Kyrgyzstan_Scawthorn_1

It is not clear whether this building under construction in Bishkek, Kyrgyzstan was designed to perform in a ductile manner (C. Scawthorn)