Development within SEID is dependant on three factors.
- Development Potential
- Experience Points
- Growth
Development Potential represents the Player Character's capacity for personal Growth. Growth is the sum of all spent Experience Points, and cannot exceed Development Potential. Both Experience Points and Development Potential can be rewarded by the GM for certain actions, generally following the pattern of Development Potential for failure, and Experience Points for success.
| Action | Experience Value |
| Succeeding any Skill Roll | 1 Experience Point |
| Achieving a stated goal. e.i. Completing a mission or personal motive. | 5 Experience Points |
| Helping another character achieve a goal. (Not a paid job, like a mission) | 3 Experience Points |
| Removing a negative Modifier from themself or another PC. | 2 Experience Points |
| Displaying inguenuity or creativity in solving a problem. | 3 Experience Points |
| Action | Gained Potential |
| Irreperably failing a stated goal. Ruining your chances or completely failing a mission. | 5 Development Potential |
| Suffering a Moderate injury. | 2 Development Potential |
| Suffering a Major Injury | 3 Development Potential |
| Suffering a Deadly Injury | 4 Development Potential |
| Failing a Rescue roll. | 1 Development Potential |
| Suffering Minor Trauma. | 1 Development Potential |
| Suffering Moderate Trauma. | 2 Development Potential |
| Advancement | Cost | Advancement | Cost |
| Increase Attribute 0>1, 1>2, 2>3 |
2 Experience Points | Train Professional Skill First, Second |
3 Experience Points |
| Increase Attribute 3>4, 4>5, 5>6 |
3 Experience Points | Train Professional Skill Third |
5 Experience Points |
| Increase Attribute 6>7, 7>8 |
4 Experience Points | Train Professional Skill Fourth |
7 Experience Points |
| Increase Attribute 8>9, 9>10 |
5 Experience Points | Train Professional Skill Mastery |
10 Experience Points |
| Select New Trait | 6x Number of Traits Experience Points |
Remove Major Trauma | 4 Experience Points |