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Copyright 2014 by EPI-USE Data Services 
Data Quality for Data Modellers 
Sue Geuens CDMP, MDQM 
October 2014
Data Quality Management is a critical support 
process in organisational change management 
Data Quality is synonymous with information 
quality, since poor data quality results in 
inaccurate information and poor business 
performance 
Data Quality is a LONG TERM 
Program, not a SHORT TERM project 
Copyright 2014 by EPI-USE Data Services
Data Quality is … and isn’t … 
Copyright 2014 by EPI-USE Data Services 
• Supposed to improve your 
data 
• Required to ensure that reports 
have appropriate output 
• Needs to enable your 
executives to make the correct 
decisions 
• Must be assessed before any 
migration/ integration project 
• DOCUMENTED 
• A once off instance of 
cleansing a piece of data 
• Supposed to fix the errors 
created by incorrect data 
modelling 
• Going to improve without 
concerted effort 
• GUNG HO effort that dies
Interface Examples 
Copyright 2014 by EPI-USE Data Services
Copyright 2014 by EPI-USE Data Services
Copyright 2014 by EPI-USE Data Services
Copyright 2014 by EPI-USE Data Services
What does Dilbert say? 
Copyright 2014 by EPI-USE Data Services
Data Model Examples 
Copyright 2014 by EPI-USE Data Services
Copyright 2014 by EPI-USE Data Services
Copyright 2014 by EPI-USE Data Services
Copyright 2014 by EPI-USE Data Services
Reasons for No Quality in Models 
• Cost 
• Timelines 
• Access to Data 
• Culture 
• Metadata 
• Over Optimistic on current model 
• Measures 
• Business Process does not require Quality 
• Data Flows 
• Not in Your Scope 
Copyright 2014 by EPI-USE Data Services
What is your Data Quality Maturity Rating? 
Copyright 2014 by EPI-USE Data Services
Copyright 2014 by EPI-USE Data Services 
Dimensions of Quality 
• Accuracy 
 Degree to which data correctly represents “real-life” entities 
• Completeness 
 Level of assigned data values that are required by business, system, application 
• Consistency 
 Applies to ensuring data sets across systems are consistent and/ or not in conflict 
• Currency 
 How “fresh” is the data compared to length of time last refreshed 
• Precision 
 Level of detail in the data element requiring specific accuracy 
• Privacy 
 Need for access control and usage monitoring 
• Reasonableness 
 Consider consistency expectations in systems and applications 
• Referential Integrity 
 Level to which data is related across database tables and columns 
• Timeliness 
 Availability of data for use and ease of accessibility 
• Uniqueness 
 The level to which the data entity is unique in the data set 
• Validity 
 Conformance to data element attributes, may be specific to database, system and/ or application 
 Permissable Purpose

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Enterprise Data World Webinars: Data Quality for Data Modelers

  • 1. Copyright 2014 by EPI-USE Data Services Data Quality for Data Modellers Sue Geuens CDMP, MDQM October 2014
  • 2. Data Quality Management is a critical support process in organisational change management Data Quality is synonymous with information quality, since poor data quality results in inaccurate information and poor business performance Data Quality is a LONG TERM Program, not a SHORT TERM project Copyright 2014 by EPI-USE Data Services
  • 3. Data Quality is … and isn’t … Copyright 2014 by EPI-USE Data Services • Supposed to improve your data • Required to ensure that reports have appropriate output • Needs to enable your executives to make the correct decisions • Must be assessed before any migration/ integration project • DOCUMENTED • A once off instance of cleansing a piece of data • Supposed to fix the errors created by incorrect data modelling • Going to improve without concerted effort • GUNG HO effort that dies
  • 4. Interface Examples Copyright 2014 by EPI-USE Data Services
  • 5. Copyright 2014 by EPI-USE Data Services
  • 6. Copyright 2014 by EPI-USE Data Services
  • 7. Copyright 2014 by EPI-USE Data Services
  • 8. What does Dilbert say? Copyright 2014 by EPI-USE Data Services
  • 9. Data Model Examples Copyright 2014 by EPI-USE Data Services
  • 10. Copyright 2014 by EPI-USE Data Services
  • 11. Copyright 2014 by EPI-USE Data Services
  • 12. Copyright 2014 by EPI-USE Data Services
  • 13. Reasons for No Quality in Models • Cost • Timelines • Access to Data • Culture • Metadata • Over Optimistic on current model • Measures • Business Process does not require Quality • Data Flows • Not in Your Scope Copyright 2014 by EPI-USE Data Services
  • 14. What is your Data Quality Maturity Rating? Copyright 2014 by EPI-USE Data Services
  • 15. Copyright 2014 by EPI-USE Data Services Dimensions of Quality • Accuracy  Degree to which data correctly represents “real-life” entities • Completeness  Level of assigned data values that are required by business, system, application • Consistency  Applies to ensuring data sets across systems are consistent and/ or not in conflict • Currency  How “fresh” is the data compared to length of time last refreshed • Precision  Level of detail in the data element requiring specific accuracy • Privacy  Need for access control and usage monitoring • Reasonableness  Consider consistency expectations in systems and applications • Referential Integrity  Level to which data is related across database tables and columns • Timeliness  Availability of data for use and ease of accessibility • Uniqueness  The level to which the data entity is unique in the data set • Validity  Conformance to data element attributes, may be specific to database, system and/ or application  Permissable Purpose