# Momentum Understand project momentum at a glance
The aim of momentum is to show you at a glance what work is moving versus stalling or regressing. Momentum complements the progress bar by showing how progress has changed with the latest work activity.
Each time a task is added to or completed for a given body of work, we look at how this changes the ratio of completed tasks to open ones. We then compare that new ratio to what the ratio was prior to the change.
For example, let's say an objective has eight open tasks and two completed ones. Now another task is completed. With no change in the number of open tasks, momentum would show an increase of 10 percent. The prior ratio was two of ten tasks completed (20 percent); the new ratio is three of ten tasks completed (30 percent).
Let's use this same example to look at how momentum might decrease. Say that when the third tasks completes, we also find the number of open tasks has increased—maybe from eight to seventeen. The prior ratio was two of ten tasks completed (20 percent); now the new ratio is three of twenty tasks completed (15 percent). In this case, we reflect a momentum decrease of 5 percent.
The momentum states are:
• Arrow up: Progress increased from X% to Y% since the last activity date.
• Arrow down: Progress decreased from Y% to X% since since the last activity date.
• Arrow flat: Progress is flat since the last activity date.
• "Scoping": No work yet completed.
• Clock + days: No activity for the period indicated (minimum seven days).
We surface momentum for: