Demographers use eigenvalues to assess population viability of wildlife. But what is an eigenvalue? And how is it calculated? Do our management actions cause the eigenvalue to change? Our interactive IsoPOPd app demonstrates how vital rates collapse into the growth rate via a single balance equation. Use the interactive app to increase your understanding of how management activities that modify one vital rate not only change the growth rate, but how that same management activity translates to change that ripples through the system.