Not a quality flag. A risk indicator. John Jackson explains why too many activities on the critical path mean too much exposure to delay, and shares the range worth aiming for: somewhere between 15% and 35%. Anything higher, and it is time for a review.

Sometimes the logic is right. Sometimes it is hiding missing relationships in plain sight. John Jackson explains how Schedule Validator defines high float, why activities carrying too much float deserve a second look, and how skipping that review is exactly how logic gaps get missed.

A hard constraint pins the date, forces the path, and quietly distorts the entire calculation downstream. John Jackson explains how they affect your critical path, why soft constraints are almost always the better choice, and how to spot when a hard constraint is dragging your schedule score down.

A constraint is not a scheduling tool. It is an override. John Jackson explains what constraints actually do to your critical path, why your dates should come from scope, time, and logic, and when (if ever) constraints belong in your schedule.

A duration with no scope assigned to it. That is the problem. John Jackson explains how lag fits into CPM, why it must be used with discipline, and the rule to follow: lag duration should not exceed half of the predecessor's duration. Use it where it belongs, and manage it consistently.

Convenient. Controversial. Often the wrong call. John Jackson explains why most industry guidelines discourage negative lag, the risks it introduces into your schedule, and better ways to model what is actually driving the sequence of work.

The schedule looks connected. It is not always calculating that way. John Jackson walks through why open starts and open finishes distort how delays flow through your schedule, what to look for during your logic reviews, and why some of these issues carry more risk than others.

Logic is the foundation of every reliable schedule. Miss it, and your critical path stops reflecting reality. John Jackson explains how missing relationships quietly corrupt your calculation, why they show up on almost every schedule review, and what it takes to close those gaps before they close in on your project.

A finish-to-start with positive lag is a gap in your logic dressed up as a plan. John Jackson breaks down why this is one of the most common schedule quality issues, why the sequence may look connected but isn't, and what the fix looks like when you assign real scope to the time in between.

The industry standard. Rarely understood. John Jackson breaks down what the critical path really is, how it gets calculated, and why understanding it changes how you manage every schedule you touch. If you use CPM but never stop to ask what it's telling you, this is where to start.