Four-Lenses Test

Scores a specific concept across the four build-risk lenses — Desirability, Usability, Feasibility, Viability — where each lens is graded ONLY by its named tool (onion+JTBD+Kano for Desirability, a watched usability observation for Usability, a dev spike for Feasibility, ICE anchored to measured value for Viability) and run by its dual-track owner (Product/Design discovery beside Engineering delivery). Fires on "is this desirable / usable / feasible / viable", "should we build it", "run the four lenses", "go or no-go on this concept", "is this worth building". Output is a filled Four-Lens Scorecard: per-lens tool, owner, evidence + ladder weight, score, and an AND gate th…