CONTENTS

1 Scope 
 2 References 
 3 Definitions  
        3.1 Terms defined elsewhere    
        3.2 Terms defined in this Recommendation       
4 Abbreviations and acronyms        
5 Conventions     
6 Functional requirements   
        6.1 Requirements framework   
        6.2 Business level requirements
        6.3 Specification level requirements      
7 Analysis     
        7.1 Scope    
        7.2 Use cases  
        7.3 Interface definition 
        7.4 Information object classes  
Appendix I – ITU-T example of trouble type     
        I.1 Trouble type