Choosing a Program Group Structure
How to pick between Newest Engagement Wins and Oldest Engagement Wins for your program group.
Last updated: April 9, 2026
A program group structure decides which program inside a program group actually runs when a customer converts. Only one program per group can fire per conversion, and this setting tells Siren how to pick the winner when more than one could apply. You’ll face this choice when you’re configuring a program group and Siren asks how it should resolve ties.
For most affiliate setups, Newest Engagement Wins is the right answer and the one you’ll see in almost every recipe. Oldest Engagement Wins is the exception, reserved for programs where early lead generation is what you actually want to reward.
A program group structure is a different setting from a collaborator group structure. The names are similar, but they control different things. A program group structure decides which program wins a single conversion. A collaborator group structure (flat, linear-chain, or parent-child) decides how Siren walks a roster of collaborators to credit peers across layers when a cascade calculation runs. If you are trying to pay an upline or a team hierarchy rather than pick one winning program, see what are collaborator groups.
Quick comparison
| Structure | What it does | Best for |
|---|---|---|
| Newest Engagement Wins | Picks the program tied to the most recent engagement | Standard affiliate attribution |
| Oldest Engagement Wins | Picks the program tied to the earliest engagement | Lead-generation programs |
How to choose
Use Newest Engagement Wins if…
You’re running a standard affiliate program and you want the collaborator who most recently influenced the customer to get paid. This is the default for a reason. When a customer clicks an affiliate link and buys shortly after, the most recent engagement is almost always the one that drove the sale. If you’re unsure which structure to pick, this is it.
Use Oldest Engagement Wins if…
You want to reward the collaborator who brought the customer in originally, not the one who closed the sale. This fits programs where lead generation is the valuable work, like high-ticket B2B sales, agency services, or courses with long consideration cycles. It also works well when you pair a lead-generation program with a separate closing program in the same group, because each program can credit a different collaborator for their part in the journey.
See the full details
- Newest Engagement Wins for last-touch attribution.
- Oldest Engagement Wins for first-touch attribution.