Launchpad has a tier based system on 3 tiers (Kardashev tiers who was a astronomer and was the first who come with idea of civilization's level based on technological advancement);
All 3 tiers have guaranteed allocations but Tier I contain the system FCFS (First Come, First Serve round).
Difference between Tier 2 and Tier 3 and how they are calculated: While tier 2 and tier 3 are both guaranteed allocations; tier 3 will have highest allocation caps per wallet, since the amount of people who are in tier 3 are much less compared to tier 2. The allocations for each tier will be: Tier 1: 34% Tier 2: 33% Tier 3: 33%
For example, if an IDO is trying to raise 1 million USD, $340.000 will be allocated to tier 1, $330.000 will be allocated to tier 2, and $330.000 will be allocated to tier 3. The calculation method for guaranteed tiers will be: Total Allocation For Tier divided by Total Amount of Wallets in that certain tier. For example, if 1000 people are in tier 2, they will each get $3.300 allocations if the total cap for that tier is $330.000 in a certain IDO. And if for example, there are 100 people in tier 3 in the same IDO, they will each get $33.000 allocations. *These examplary numbers will vary for each IDO according to raise cap, and holders in tiers, although the calculation method described will be constant on every single IDO.
