# What makes an econometric model robust?

I was reading a paper on robustness (http://econ.ucsb.edu/~doug/245a/Papers/Robustness%20Checks.pdf) and they say:

"To determine whether one has estimated effects of interest, $\beta$; or only predictive coefficients, $\hat{\beta}$ one can check or test robustness by dropping or adding covariates."

What does a model being robust mean to you? Is this the only way to consider it in an econometric sense?