Insect knowledge/applying it on the stream

When fishing a stream and seeing risers how do you usually base your
decision on what fly to use? although looking at the water can sometimes
tell you what flies are on the surface or just below, many times the
bugs being taken are not in sight and or if they are arent the ones
being eaten.
I feel like i usually base my fly selection on rise form first then
select a fly that coincides with that sort of rise. Slash=caddis pupa or
emerging mayflies for that time of year if the time of the rise makes
sense with an emergence,small dimple=tiny olive parachute or a dropper
technique, and so on. This works many times although its not as if I
nessesarily match the hatch but instead match the level of water the
fish may be feeding in.

just curious to see the thought process everyone else goes through when
working with rising fish.


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flyI4
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