ISO maintains an Online Browsing Platform (ODP) which allows access to details of ISO standards, e.g. the clauses Foreword, Introduction, Scope, Normative References, Terms and definitions, Abbreviated terms, Bibliography. The OBP also lists references from other standards.
This ODP supports the reader in the decision to buy a standard or not. It helps in drafting other standards by disclosing all definitions of terms, and all abbreviated terms.