The Lean Startup Framework is the brainchild of Eric Ries, author of "The Lean Startup: How Today's Entrepreneurs Use Continuous Innovation to Create Radically Successful Businesses". It is a very popular framework especially among software startups. The core tenets include reducing waste by building the Minimum Viable Product (MVP) - the smallest possible thing that can enable you to test your idea in the field, and then doing multiple build-measure-learn loops and iterating your way to product-market fit.
The framework is very good for software projects, with two caveats: First, the framework assumes you have chosen a beachhead market. A small amount of strategic thinking before you enter the build-measure-learn iterations will help you make sure you are iterating in the right area of interest. Second, the framework needs significant adaptations for non-software products that have either a high development cost to create prototypes, or a long lead time for each prototype due to procurement lead times, or both. This means hardware products naturally will take longer to complete each build-measure-learn loop than hardware products. Medical devices take even longer due to the regulatory approval cycle. Pharmaceuticals have a different cadence and don't really apply here.
The general principles of not scaling prematurely and spending time in the field continuously testing and refining the product still holds.