Blood Donor Challenge Summer 2026 RWTH

Step 1 of 4

1. Why neither absolute nor purely proportional systems are fair

The Blood Donor Championship brings together student councils of vastly different sizes – ranging from small councils with around 100 to 150 students to large ones with nearly 10,000 students.

❌ Model 1: Absolute Count (1 Donation = 1 Point)

Large councils would hold an insurmountable advantage. Even if only 5% of a 10,000-student council donates (500 donations), they easily beat a small council of 150 members – even if 80% of them donate. Small councils wouldn't stand a chance.

❌ Model 2: Purely Proportional (Donations / Members)

In smaller councils, organizing groups (e.g., committee members or study groups) to donate together is much easier. A group of 10 people makes a massive percentage impact. Large councils would need to mobilize hundreds of students for the same effect. Small councils would have an unfair advantage.

Step 2 of 4

2. Berechnungsformel

To balance both worlds fairly, we apply a mathematical damping method using a power function (Members^0.6).

Calculation Formula

Points per Donation =

197 Members ^0.6

Why 197? A scaling factor designed to keep point values manageable, yielding roughly 1 to 10 points per donation depending on council size.

Comparing our smallest (144) vs. largest council (9,805):

Exponent 0.5 (favors large councils): 1 donation from the smallest council equals only 8.25 donations from the largest.
Exponent 0.7 (favors small councils): 1 donation from the smallest council equals 18.85 donations from the largest.
Exponent 0.6 (our compromise): 1 donation from the smallest council equals exactly 12.44 donations from the largest. We hope this ensures a fair competition. We will evaluate this factor after the campaign and adjust it if needed for next year.

Step 3 of 4

3. Points per Student Council

Here is how many points 1 donation earns for each respective student council:

Student Council	Member Count	Points per 1 Donation

Step 4 of 4

4. Data Source

Official student numbers were provided directly to the AStA Organizational Committee by RWTH Aachen University.

Blood Donor Challenge Summer 2026 RWTH

🩸 Point Calculation

1. Why neither absolute nor purely proportional systems are fair

❌ Model 1: Absolute Count (1 Donation = 1 Point)

❌ Model 2: Purely Proportional (Donations / Members)

2. Berechnungsformel

Comparing our smallest (144) vs. largest council (9,805):

3. Points per Student Council

4. Data Source

Thank you for your blood donation!

Blood Donor Challenge Summer 2026 RWTH

🩸 Point Calculation

1. Why neither absolute nor purely proportional systems are fair

❌ Model 1: Absolute Count (1 Donation = 1 Point)

❌ Model 2: Purely Proportional (Donations / Members)

2. Berechnungsformel

Comparing our smallest (144) vs. largest council (9,805):

3. Points per Student Council

4. Data Source

Select Your Faculty

Thank you for your blood donation!

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