Define the decision
Before building anything, ask what decision the prototype needs to unlock: budget approval, client validation, technical confidence, investor interest, or user feedback.
A prototype should answer a question. It does not need every feature. It needs enough of the product to help users, stakeholders, or investors understand what is possible.

A quick, plain-English starting point you can use before you scope a project, brief a supplier, or decide what to build.
Before building anything, ask what decision the prototype needs to unlock: budget approval, client validation, technical confidence, investor interest, or user feedback.
The first version should focus on one user journey, one workflow, or one impressive proof point. A smaller prototype is easier to test and easier to explain.
Some parts can be static. Other parts need to be interactive. Spend effort on the moments that prove the idea, not on settings pages and edge cases nobody will inspect yet.
A good prototype should create a better build plan: what to keep, what to remove, what data is needed, and what the production system should cost.
If the idea is still fuzzy, that is fine. We can help turn the problem into a focused first version: a website improvement, workflow automation, dashboard, prototype, SaaS MVP, digital twin, XR demo, or spatial product.