Lecture19.pdf, Exams of Database Management Systems (DBMS)

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Data Collection II

Lecture 19: CSE 490c

Announcements

• New Homework Available
  • Programming Assignment 3, Low-literate UI for UW- Pesa, Due Wednesday, November 21
  • Homework 6, Icon Design for PA3, Due Wednesday, November 14

Open Data Kit

• ODK 1.0: Forms based data collection
• ODK Collect: Android App, ODK Aggregate: Server
• ODK 1.0 widely adopted by researchers and NGOs
  • Covers well defined use case of forms based data collection
  • First product to market
  • Established ecosystem and user community
  • Open source so now software costs or licensing ODK Collect ODK Build ODK Aggregate Data Form Form

Data Integrity

• Traditional problem with surveyors
  • What if enumerators cheat
  • This even has a name: curbstoning
• Data collectors make up data instead of doing surveys
• Methods for detection
  • Made up data often is not random enough
  • Consistent omission of data
    • E.g., Missing informant phone numbers
  • Made up data may not have appropriate means
    • E.g., Across sample, 40% of households might be away, while faker only identifies 20% of households being away

Security

• Threat Model
  • CIA Goals: Confidentiality, Integrity, Availability
  • Adversaries
    • Governments, Thieves, Hackers, Partners, Enumerators
  • Potential Threats
    • Unauthorized access
    • Entering fake data
    • Coercing enumerators
    • Theft
    • Legal access to data
    • Instability of application
    • Information leakage on device
    • Fake ODK applications Computer Security for Data Collection Technologies, Cobb, Sudar (2016)

Interview Study

• What do users care about
  • Data Loss
    • Encryption not used, because it risked data loss
  • Integrity
    • Enumerators answering “no” to shorten interview
  • Exploited data
    • Generally less of a concern, but there are some very sensitive ODK deployments
• Importance of device management
• Different levels of technical expertise
• Ethics board considerations
• Context: Comparison with Paper

ODK Research Projects

• ODK Clinic
  • Integrate with Medical Record System
• ODK Sensors
  • Provide drivers to allow sensors as input
• ODK Submit
  • Extend communication model to support a broader range of transport mechanisms to reduce cost
• ODK Scan
  • Use the camera for paper to digital input
  • Restricted forms of input: bubble forms and numbers

Limitations of ODK 1.

• IMHO the success of ODK 1.0 is due to its focus on a core data collection use case
• But what else did people want?
  • Greater flexibility with user interface
  • Ability to collect data based on previous data
• ODK 2.0 developed as a data management platform requiring greater sophistication in application development and deployment

ODK 2.0 Features

• Fully customizable layout of prompts on the Android device
• More flexible, user-directed, navigation of a survey
• Bi-directional synchronization of data across devices
• Data curation and visualization on the device
• Row-level access filters

ODK 2.

• ODK Application Designer
• ODK Survey
  • Data Collection app based on HTML, CSS, JavaScript
• ODK Tables
  • Data Curation and Visualization app
• ODK Services
  • Application for syncing data across multiple devices and with server
• ODK Cloud Endpoints

ODK 2.0 Cold Chain Demo I

ODK 2.0 Cold Chain Demo II

ODK 2.0 Cold Chain Demo IV

ODK 2.0 Cold Chain Demo V