Module 4: Project - Technology Selection and Desi
TECH460 Module 4
Technology Selection and Design
Rubric
Criteria Total Include problem statement from previous deliverable 10 Identification of two alternative technologies 20 Qualitative analysis of technologies 20 Quantitative analysis of technologies 20 Technology selection and justification 40 High-level design 40 Total 150
Problem Statement
• Support Fitbit’s addition of a blood pressure monitoring capability through design of a web and mobile app user interface with the following features: • Display blood pressure readings numerically and graphically
• Track changes over time
• Identify low/high readings and trends that may indicate health concerns
Alternative Technology Approaches
• New Progressive Web App (PWA) • Single blood pressure monitoring app for all platforms (web, iOS, Android)
• Separate from existing Fitbit apps
• Linked from existing Fitbit website
• Single codebase implemented in HTML, CSS and JavaScript
• Website plus platform-specific extensions to existing apps • Web interface using HTML, CSS and JavaScript for browser access only
• Extensions to existing Fitbit apps implemented in native code • iOS: Swift/Objective-C
• Android: Java
Source: Google Developers, 2020.
Qualitative Analysis
• Progressive Web App (PWA) • Advantages
• Faster development time • Reduced development cost • Reduced maintenance cost • Greater consistency across platforms
• Disadvantages • Unable to integrate with existing
mobile apps • Not visible in standard app stores • Limited user interface options • Limited access to native device
features
• Website plus platform-specific extensions to existing apps • Advantages
• Can integrate BP monitoring feature into existing apps
• Fuller range of user interface options • Full access to native device features
• Disadvantages • Separate development required for
each platform • Higher development time and cost • Higher maintenance cost • Risk of inconsistency across
platforms
Source: Moqod, 2019.
Quantitative Analysis
• Estimated development cost for PWA: $17K - $20K
• Estimated development cost for website plus platform-specific apps • Website: $17K - $20K • Android: $17K - $20K • iOS: $17K - $20K • Total $51K - $60K 3x higher cost due to separate development for each platform
• Estimates based on Crowdbotics software development cost calculator with the following inputs: • Partial wireframes developed • Moderate visual appearance customization • Medium complexity • HIPAA compliance for health data • Pro developers (not necessarily USA-based) • 1 API integration • Regular updates • Moderate support level
Recommended Solution
• Website plus platform-specific extensions to existing apps
• Justification • Integration with existing Fitbit apps is top priority
• Users will not want to download a separate app just for BP monitoring
• Users will want to view BP data in context with other health and fitness data
• Value of integration justifies higher development and maintenance costs
High-Level Design – Data Flow
Current BP data from sensor
BP data received from wearable
Manually entered BP data
Collected/processed BP data for display
Manually entered BP data
Collected/processed BP data for display
Fitbit Cloud
Wearable device with BP sensor Android or iOS
smartphone
User laptop or desktop
Fitbit app w/ BP
extension
Fitbit web app in browser
High-Level Design – User Interface
Systolic
Diastolic
Systolic
Diastolic
Level
110 70
Normal
< Back
Return to main app/website menu
Add manual entry – brings up entry form as overlay
Graph of historical readings
Current reading
Color-coded level for current reading based on ACC/AHA
guidelines (CDC, 2020)