How to find alternate critical path in MS project schedule

[pnperl]

In MS project, by using gantt chart wizard, we can find critical path of the schedule. but how to find next critical path, if first critical path become normal activity, then how to find which activity path will be the next critical activities ?

 

[PDQBach]

If you know which task is going to become critical you are in possession of the greatest knowledge of any PM I have ever met.

Since you (probably) can't do that:

"Critical path" are tasks with 0 days of slack.

So display the Total Slack column and filter on tasks with 1 or 2 or 3 days (or whatever range you want) ... those are the ones that have the least amount of time that they can "slide" before impacting the critical path.

You can also Tools > Options > Calculation tab and set the "Tasks are critical if slack is less than or equal to" to some value other than 0 and then use View > Tracking Gantt to see the critical path.