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Innovative Technologies for Making Crowdsourcing most Effective inOnline Indexing
Dr. Jesper ZedlitzChristian-Albrechts-Universität Kiel
Verein für Computergenealogie = German Society for Computer Genealogy
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CompGen · CAU Kiel
Agenda
● Short introduction
● Examples
● “Data Entry System” (DES)
● Transcription Speed
● Transcription Quality
● Future development
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CompGen · CAU Kiel
Short Introduction
● Verein für Computergenealogie
= German Society for Computer Genealogy
– since 1989
– largest German Genealogical Society
– 3.600 members
– no public funding
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CompGen · CAU Kiel
DES – The Project
● DES = Data Entry System
● objective: transcription of structured data from printed sources
Family name: KühnelBirth name: ZiltzGiven names: Hertha AntoniaDate: 22.2.Record number: 100
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CompGen · CAU Kiel
DES – The Project
● start beginning of 2012
● first project: German WW1 casualty lists
– 31,000 pages
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CompGen · CAU Kiel
DES – The Project
● meanwhile variety of other sources
– city directories,
– civil records,
– war grave lists, …
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CompGen · CAU Kiel
DES – Technology
● web-based solution
+ no DVD shipping necessary
+ does not require special software
+ quick assistance possible
● work “on the image“
● search during work
+ voluntary transcribers want to see “their” entries online
● two-tiered transcription
1. single entries
2. groups of entries
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CompGen · CAU Kiel
Approaches
● single transcription + double proofreading– e.g. Wiki-Source
● proofreading with arbitration
expert
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CompGen · CAU Kiel
Approaches
● double-keying with arbitration
● double-keying with N-keyed run-off votes
A B A, B or C
…
A B C A
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CompGen · CAU Kiel
Quality Improvement
● German WW1 casualty lists– Gothic print
● small sample of 5,000 entries
● on average 15.6% errors for single keying
● varies from 6% to 78% for different users
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CompGen · CAU Kiel
Quality Improvement
15.6% difference
1.1% difference
only 2.4% errors spotted
85% of the error remained undetected!
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CompGen · CAU Kiel
Future Development
● Entry of relations between entries
● Data Entry on mobile devices
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CompGen · CAU Kiel
Future Development
● Entry of relations between entries
● Data Entry on mobile devices
● Captchas
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CompGen · CAU Kiel
Future Development
● Entry of relations between entries
● Data Entry on mobile devices
● Captchas
● Combination OCR + manual transcription