Blockers: how to make them visible and clear them fast

Worth separating, because the fixes differ. A bottleneck is a stage that's structurally too slow, work piles up there every time, and the fix is capacity or process (see finding your bottleneck). A blocker is one specific card that can't move right now: it's waiting on a supplier, a decision, an answer, a part. Bottlenecks are about the system; blockers are about an individual item stuck on something external. This article is about the second kind, the ones that hide.

On most boards a blocked card sits in its column looking identical to a card in progress. The person who knows it's stuck moves on to other work, the knowledge stays in their head, and the card quietly ages. Days later someone asks "whatever happened to that?" and discovers it's been waiting on an email since Monday. The waiting was invisible, so nobody chased it. Blocked time routinely dwarfs working time, and almost all of it is recoverable just by making the block visible the moment it happens.

The mechanism is simple: mark blocked cards distinctly (a tag, a flag, a colour) and write WHAT it's waiting on and SINCE WHEN, right on the card. Now a blocked card is loud instead of invisible, and anyone scanning the board sees the stuck ones at a glance. In Production Board a blocked tag plus a one-line note ("waiting on supplier quote, since Tue") turns a silent delay into something the next standup will obviously act on. The note matters as much as the flag: "blocked" without "on what" just relocates the mystery.

Make blockers the first thing the team looks at in your daily stand-up, before status updates. Scan for the flagged cards and ask one question each: what's needed to unblock it, and who owns getting that? Then add a clock: a blocker that's been stuck past a threshold (say two days) gets escalated, not just noted again. Without an escalation rule, the same card gets "still blocked" said about it every morning for a week. Visible plus owned plus time-bound is what actually clears blockers instead of merely cataloguing them.