Deciding on Keywords with Software

I am curently using a software to decide on the effectiveness of the keywords to be used. Sometimes, the software says "No keywords found" for the keywords which seem very relavant and germane. Can I discard what the software says and go on to use the keyword which I assume to be effective? PLease help this greenhorn.

difficult question to anawer Maneesh. The data source will always have a margin of error e.g. +/- 25%.

A good example of this is Wordtracker - keyword results uses metacrawler usage to provide a baseline for usage to identify global use.

This is then superimposed onto market shares (searches) by each search engine - not a direct feed.

The factual "use" results could be out by 50% but this isn't "targeted use" but all uses.

e.g. webmasters/SEO manually and automatically checking their ranks (or client ranks) are included in this results - but likely not to visit your site... right?

I have seen ratings at 300 uses per day in Google have client listings at #1 and #2, plus AdWords, and Premium listings and produce 10 per month where theoretically the term should be pushing 9K.

Others say 0 and provide 20 per day.

Tools assist in decision-making but they don't offer absolute answers! ;)