That funnel is from the Dale Carnegie sales process. It is featured in the ACT contact manager.
It is one method of a sales funnel. To me it is a sales process funnel that involves prospects that haven't even been approached.
The model I use closely resembles a forecast.
It is a 30 60 90 day model.
For each prospect I have on my 30 60 90 forecast, I have certain triggers that are used to rate them by percentile 90% 70% and then 50%.
The triggers involve an interest in the product, money in budget, decision makers identified etc etc.
I am not saying mine is the best. What is important is that you have a system to monitor your prospects and manage the sales process.
Good Selling!
Sell4alivn