Will producing a solution to this problem delight your customers? Will eliminating this pain point make them want to use your product or service? Would they be willing to pay for it?
The problem sizing canvas helps to make a quick guesstimate regarding the value of a specific customer problem.
Rather than create complicated spreadsheets, this tool forces the team to agree on a couple of key assumptions. Keep adjusting the template after you have (in)validated those assumptions.

Once a problem’s size has been validated, you can start thinking of solutions