Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. analysis and testing techniques

Anotations

Scope note:

Impact-echo is a nondestructive evaluation technique for masonry construction which detects flaws by monitoring impact-generated sound waves that are disseminated through a structure and are reflected by internal flaws and external surfaces.