You are appointed to work with the structural engineer to evaluate the integrity of a $50-$yearold government building that has shown signs of wear and possible internal damage. The building is a combination of reinforced concrete and steel structures. Concerns have been raised about the potential carbonation of the concrete, deterioration of the steel reinforcement, and overall strength and durability of the concrete. Your joint task is to recommend and justify the use of specific NDT methods $($visual inspection, rebound hammer test, carbonation test, and permeability test$)$ to assess the current condition of the building's structure.