The most common pipeline mistake is naming stages after what the seller does instead of what the buyer has agreed to. "Sent proposal", "Following up", "Negotiating" describe your activity, and activity is a terrible measure of progress because you can send ten proposals into a void and feel busy while closing nothing. Stages built on seller verbs produce pipelines that look healthy right up until they collapse.
Name every stage after a buyer commitment instead. A deal advances when the buyer does something that costs them: agrees to a discovery call, confirms there is a budget, brings the economic buyer to the table, accepts the proposed scope, signs. Each stage is a gate the prospect has chosen to walk through, not a box you ticked. That single shift makes your pipeline honest.
This gives every stage a clear, arguable entry criterion. "Qualified" should mean a defined set of facts are true, not that a rep had a good feeling. Write the entry condition next to the stage so two reps would place the same deal in the same place without negotiating. If your stages cannot pass that test, your forecast is a mood ring.
Keep the count low. Most B2B sales processes need five to seven stages, not twelve. Every extra stage is a place for deals to sit and rot while looking like progress, and it adds friction the reps will resent. Fewer, sharper, buyer-defined stages give you a cleaner read on where deals genuinely stall.
Be ruthless about the difference between a stage and a status. Whether a deal is "waiting on legal" or "out for signature" is often a property or a task, not a new pipeline column. Reserve stages for genuine shifts in buyer commitment, and push the operational detail into fields and activities underneath.