In Primavera P6 application, you will find many toolbars (shown in the picture below). Many a times, these  toolbars change their positions by accidental mouse clicks and drags. Sometimes, they will even disappear  from their place.

Here, I will explain an easy and a two-step method to reset the toolbars to bring them back and to their
original positions.

Step 1: Open 'View' menu

Step 2: Click on 'Reset toolbars'

Now all toolbars are back and in their original positions.

Also, find out how to lock the toolbars so that they never move or disappear. Find the easy instructions here.

Out-of-Sequence (OOS) activity is an activity for which its relationship has been violated, as shown in the image below:

In the example above, activity B had FS relationship with activity C. However, activity C has been updated and assigned an actual start date before Activity B.

How Out of Sequence Activity is Managed?

OOS logic should be corrected to preserve the integrity of the schedule model unless OOS for the activity was really necessary. Often, planned sequence is not correct, hence OOS logic is retained.  Out of sequence activity can be implemented in two ways:

Retained Logic

Retained Logic is recommended to comply with activity relationship to some extent.

Progress Override

Retained Logic, Progressive Override options can be set in Primavera software.

See the image at right for better understanding of progress override and retained logic options.

These are the very easy-to-follow and thorough books to learn Primavera P6.

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In project schedule, you can have two different types of critical activities. Both of the type are made by different ways and have different purpose in project schedule management. 

Longest Path:

This critical path shows longest activity in your schedule. Or it could be a longest set of activities in your schedule. But you may ask, why the longest activity or set of activities are critical? The answer is simple. The longest activity or the longest set of activities consume most of your project time, they most probably need most of your budget and resources. Also, since these activity (ies) are the longest, these post more risk and cause more issues in the project. Moreover, you need more attention and effort on these activities.

Look at this critical activity (Longest Path) example: 

That's the reason, that longest activity(ies) are considered longest. But you might say, that is a good reason to call an activity or activities 'critical' but that isn't a significant reason perhaps to call an activity critical. Well, I would agree with you. And that is why we have another type of critical activities, which are described below:

Total Float = 0

These critical activities have no name like 'Longest Path' but these are formed when these have no margin left. In other words, these cannot be delayed further. And if they do delay, they will delay the project. Look at the Total Float=0 critical activities example below:

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