In many engineering contexts, modify and change would mean two distinct things. Of course, it's context dependent but: - "Modify" this part on the widget: Plea

In many engineering contexts, modify and change would mean two distinct things. Of course, it's context dependent but: - "Modify" this part on the widget: Please alter this part to function correctly. - "Change" this part on the widget: Please replace this part with a new part so that the widget functions correctly. e.g. if I modified a cover, it probably means I drilled an extra hole or something to make it fit.....if I changed the cover, it probably means that I found a new cover that had the right hole.