Conversion Rate optimization and Sign Up Measurement Methodology :
A- Tools

Web Analytics and Traffic measurement tools
Eye flow
Click Density heat
Google Website Optimizer

B- Conversion rate measurement for different channels

1. A/B Testing
2. Multivariate promotional testing
3. Display Ad Optimization * content and Ad Creative message
4. Landing Page optimization
5. Sign up page Optimization
6. Cross selling Optimization

A/B Testing

Multivariate promotional testing

Display Ad Optimization * content and Ad Creative message

Landing Page optimization

Sign up page Optimization

Cross selling Optimization

C- Website Sign Up optimization

https://www.google.com/analytics/siteopt/siteopt/help/overvw.html