Table 3.

Examples of errors found in concepts with different kinds of partial-area-taxonomy-defined characteristics. The OAF was used to identify which characteristic(s) each concept exhibited and to browse the relevant partial-area taxonomies.

Characteristic	NCIt Subhierarchy	Erroneous Concept(s)	Error
Concept summarized by a small partial-area	Disease, Disorder, or Finding	Ameloblastic Carcinoma	Missing several Disease may have finding restrictions (e.g., to Oral Hemorrhage). Several incorrect restrictions (e.g., Disease has primary anatomic site should have a range of Oral Cavity, not Lip and Oral Cavity)
		Brain Astrocytoma	Missing superclass Malignant Brain Neoplasm, missing several Disease may have finding restrictions
Overlapping concept	Disease, Disorder, or Finding	Refractory Adult Spinal Cord Neoplasm and Refractory Childhood Spinal Cord Neoplasm	Both concepts are missing Disease has primary anatomic site restrictions with a range of Spinal cord
		Splenic B Lymphoblastic Lymphoma	The Abnormal cell restriction does not express malignancy
Concept summarized by root area	Biological Process	ATP Hydrolysis	Missing an Is part of process restriction with a range of Energy Metabolism Process
		DNA Folding	Missing a Has associated location restriction with a range of Nucleus
Concept in high-indexed area in partial-area taxonomy	Biological Process	Granulocyte Differentiation	Missing superclass Myeloid Cell Differentiation
		Nuclear Division	Missing a Has associated location restriction with range of Nucleus