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# Table of Contents
-[License](License.md)
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1 [Background](Background/Background.md)
+**[License](License.md)**
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**1 [Background](Background/Background.md)**
1.1 [The Role of the Common Data Model](Background/TheRoleoftheCommonDataModel.md)
1.2 [Design Principles](Background/DesignPrinciples.md)
1.3 [Data Model Conventions](Background/DataModelConventions.md)
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2 [Glossary of Terms](GlossaryofTerms.md)
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**2 [Glossary of Terms](GlossaryofTerms.md)**
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**3 Standardized Vocabularies**
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3.1 CONCEPT
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3.2 VOCABULARY
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3.3 DOMAIN
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3.4 CONCEPT_CLASS
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3.5 CONCEPT_RELATIONSHIP
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3.6 RELATIONSHIP
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3.7 CONCEPT_SYNONYM
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3.8 CONCEPT_ANCESTOR
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3.9 SOURCE_TO_CONCEPT_MAP
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3.10 DRUG_STRENGTH
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3.11 COHORT_DEFINITION
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3.12 ATTRIBUTE_DEFINITION
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**4 Standardized Metadata**
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4.1 CDM_SOURCE
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**5 Standardized Clinical Data Tables**
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5.1 PERSON
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5.2 OBSERVATION_PERIOD
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5.3 SPECIMEN
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5.4 DEATH
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5.5 VISIT_OCCURRENCE
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5.6 PROCEDURE_OCCURRENCE
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5.7 DRUG_EXPOSURE
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5.8 DEVICE_EXPOSURE
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5.9 CONDITION_OCCURRENCE
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5.10 MEASUREMENT
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5.11 NOTE
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5.12 OBSERVATION
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5.13 FACT_RELATIONSHIP
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**6 Standardized Health System Data Tables**
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6.1 LOCATION
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6.2 CARE_SITE
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6.3 PROVIDER
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**7 Standardized Health Economics Data Tables**
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7.1 PAYER_PLAN_PERIOD
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7.2 COST
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**8 Standardized Derived Elements**
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8.1 COHORT
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8.2 COHORT_ATTRIBUTE
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8.3 DRUG_ERA
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8.4 DOSE_ERA
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8.5 CONDITION_ERA