If you're validating solutions then it means you've tested your problem extensively and have discovered a particularly meaningful challenge to address in your user's everyday life.
Now it's time to begin building and testing solutions for the problem that you've validated. Use the tools below to understand whether your solution is best suited to meet the needs of your users. Don't forget that tools you've used in the Problem Validation phase could also prove valuable as you work to test and refine your solution.