Booking A/B/C/D Tests And Detects A Better Calendar Widget

Booking has been testing at least 3 variations of their calendar widget - a key component that affects availability and prices of rooms. In a nutshell, the variations explored ways of letting users express more flexible date inputs in at least two ways: using day ranges and wider months. The concept looks very similar to what Airbnb has rolled out over a year ago. Interestingly the more flexible variations with numerous inputs seems to be working best for both companies. The experiment is also a great example of a cascade variation where the last variation (D) combines elements from both B and C together into a compounded one - possibly checking for interaction effects.