it depends what my rig is.
There are sometimes when i fish on lakes that i get screamers all day. Then go another time, use the same rig and maybe not get as many. But there are other times where i use the same rigs, and i get nothing. Although if i'm using the same bait as before then i might look at my rig.
For instance, if i was fishing over some fairly deep silt, i might use one type of rig to aid presentation. This might also be a very successful way of presenting the bait, whatever it may be. But if the next time i was using the same rig and same bait and catching nothing, what would i change considering im fishing in silt. If i change the bait and this doesn't work, would i change the rig, or change the bait again. Considering the different flavours of baits, i could be there all day! Though as i'm fishing over fairly deep silt, im sort of limited to the rigs i can use.
Hope that made some kind of sense and you can see what im getting at.