There are a number of tools available for tuning plugins and configurations, identifying exact parts of a process or config section require your attention.
Rules Debug Log
The Rules Debug Log is built-into Rules and is available through the settings page. It's a very useful complement for the configuration and programming processes, because it follows what rules are executed and displays that information for you in the help region.
For example, it can show what conditions are evaluated TRUE or FALSE, which variables were used, what order operations were executed, how long time each step takes, etc etc.
If something unexpected is happening, then viewing that output is a very helpful way of pinpointing why it is happening. Once you identify the source of a problem, click the  link next to the event.
Also, we've included edit links so you can easily jump from the debug log to the Rules UI in order to fix up a miss-configured rule.Read more