Constant qualification is the process of continuously evaluating all of your opportunities to check that you still want to and should be bidding. It is possible to get caught up in an opportunity that you are unlikely to win and that diverts valuable resources and time from other more suitable opportunities.
First off, you need to understand the importance of having a formal bid/no bid process. This is to help you understand when and why you should bid, and to make sure you avoid projects that you have a low probability of winning. Sometimes a decision is made early to bid but is that still the right decision as you learn more about the opportunity?
As you get greater understanding of the specification you may realise that it isnt as suitable for you as you first imagined; circumstances change an existing client may need a project extending and you havent got the required resources; or you find out that the client hasnt got the budget that you thought they had. Although youve invested time in the opportunity that doesnt mean its too late to get out.
With any opportunity, one thing you need to do is keep finding out more about it. Ask questions and learn...