Hello Dan, Thanks for sharing. I have also used the seed list method. There are some differences in the way I implemented them for each program.  I created a default program to hold my seedlists (Static Lists) and reference the static lists when I am building my audience wether it be on a smart campaign smart list or a default email program. This worked very well for smart campaigns and email programs. In the case of an engagement program I just added the seedlist members to the engagement program but the program only had 1 stream. I can imagine it can get tricky depending on transitional rules and the complexity/quantity of streams. ... View more