> ## Documentation Index > Fetch the complete documentation index at: https://docs.nebulaengage.com/llms.txt > Use this file to discover all available pages before exploring further. # Skills, XP, and Progression in Nebula > Nebula tracks your professional growth across six skill categories using XP, credits, and skill scores that persist across every session you complete. Nebula doesn't just simulate work — it measures your growth over time. Every session you complete contributes to a persistent progression profile that tracks six professional skill categories, your total experience points (XP), and a separate credits balance. Your skills improve based on how you perform at decision checkpoints, and your XP accumulates across sessions so your profile reflects everything you've done in the platform — not just your most recent run. ## The six skill categories Nebula evaluates every decision and action you take against six core professional skills. These categories are designed to capture the full range of competencies that matter in real workplace environments. How clearly and effectively you exchange information with coworkers, stakeholders, and managers. Covers written communication, clarity of requests, and responsiveness. Your ability to evaluate options, weigh trade-offs, and choose a course of action under pressure and uncertainty. How well you identify, engage, and maintain relationships with the people who have influence over your work — including those above and outside your team. Your grasp of domain-specific knowledge and your ability to apply analytical or technical thinking to the problems in your scenario. How you handle accountability, guide others, take initiative, and navigate authority — even when you're not the most senior person in the room. Your ability to prioritize work, meet deadlines, manage competing demands, and make smart trade-offs when resources are constrained. ## How skills improve Your skill scores update based on how you perform at **decision checkpoints** — the structured moments in a scenario where you're asked to make a meaningful choice. Each checkpoint is evaluated and scored. That score feeds directly into the relevant skill categories based on the nature of the decision. For example, a checkpoint that asks you to respond to a difficult manager might score your communication and stakeholder management. A checkpoint that asks you to reprioritize tasks under a budget constraint might score your decision making and time management. Skills don't reset between sessions. Each session adds to your cumulative skill profile, so your scores gradually reflect your real patterns of behavior across many simulations. Each skill also has an `xpToNext` value that tells you how much more XP is needed before your score advances to the next level in that category. ## XP XP (experience points) is the primary currency of progression in Nebula. You earn XP by completing objectives, submitting decisions at checkpoints, and taking meaningful actions during a session. XP gains are tracked both per session and per skill category, so you can see which areas you're developing most actively. XP is cumulative — it never resets. Your `totalXp` grows across every session you complete, and it reflects the breadth and depth of your engagement with the platform over time. **Common XP sources:** * Submitting and completing decision checkpoints * Completing session objectives * Taking the optional baseline assessment during onboarding * Completing a session (vs. abandoning it) * Actions taken inside the workspace that advance the scenario Completing sessions — even difficult ones — earns more XP than abandoning them mid-way. The session report is only generated on completion, which is also when the largest XP payouts are applied. ## Credits Credits are a separate balance from XP. While XP measures your growth and activity, credits are a reward currency that accumulates alongside your progression. Your credits balance is stored in your progression profile and persists across all sessions. How credits are used within the platform is shown in the dashboard. ## Readiness signals At the end of each completed session, your session report includes a **readiness signal** — a qualitative assessment of how your performance maps to real-world role expectations. This signal isn't just a score; it tells you what your decisions and patterns suggest about your current readiness for the kind of work you practiced. Readiness signals are generated from the full picture of your session: your checkpoint scores, the patterns in your decisions, your strengths, and the areas where your approach fell short. Over time, as your skill scores improve and your decision patterns mature, your readiness signals should reflect that growth. ## How progression persists Your progression profile is always live. It updates at the end of every completed session and reflects your entire history on the platform. ``` Progression ├── totalXp — cumulative XP across all sessions ├── credits — current credits balance └── skills[] — one entry per skill category ├── category — e.g., "communication", "leadership" ├── score — your current score in this category └── xpToNext — XP remaining until the next score level ``` Because progression is tied to your user account and not to any individual session, switching companies or trying different domains doesn't split your progress. Everything you do across all 12 companies and all four domains contributes to the same unified profile. See how individual sessions are scored and what they contribute to your progression. View your full skill profile, XP history, and credits balance.