@AnnM4620 Hi. In the first place, it is important to be mindful of the total daily volume. This can give you an estimate on how much traffic will go through various branches and so you'll get an estimate of how long it will take for your models to mature (if they are starting from no learnings). In general the champion challenger component is using a simple random number generator in the background that is used to split the data traffic. This means, not necessarily a customer will always be assigned to the same branch (champion or challenger). If you'd like to have a long-term and consistent assignment of customers to the champion or challenger components, you may want to use hash functions based on Customer ID. you can also include time in the hash function to shuffle the assignments after certain time period. Hash functions are available in CDH