Is there practically any clear difference between the approaches of failure analysis and of failure prevention? The FMEA method, for instance, I consider for failure analysis and prevention. But, how can I clear define and differentiate one approach from another? What would be the criteria to classify them methods/tolls and best practices in the groups of (1) failure analysis, (2) failure prevention and (3) failure analysis and prevention?
I am trying to sort methods/tools and best practices for failure analysis and for failure prevention. But for that, I need first a clear definition and criteria.

Failure Analysis - the process of collecting and analyzing data to determine the cause of a failure and how to prevent it from recurring.
Tools:


Forensic Analysis
Fault Tree Analysis
Causal Analysis
8D/7D/5-Why Analytical Problem Solving

Failure Prevention - the process of anticipating potential failures before they occur and taking action to ensure that they do not occur.
Tools:


Failure Modes and Effects Analysis (FMEA)
Failure Mode, Effects, and Criticality Analysis (FMECA)
Sneak Analysis (Electrical and Software)
Hazard Analysis
Common Cause Failure Analysis
Monte Carlo Analysis
and many, many others

Failure Analysis - the process of collecting and analyzing data to determine the cause of a failure and how to prevent it from recurring.
Tools:


Forensic Analysis
Fault Tree Analysis
Causal Analysis
8D/7D/5-Why Analytical Problem Solving

Failure Prevention - the process of anticipating potential failures before they occur and taking action to ensure that they do not occur.
Tools:


Failure Modes and Effects Analysis (FMEA)
Failure Mode, Effects, and Criticality Analysis (FMECA)
Sneak Analysis (Electrical and Software)
Hazard Analysis
Common Cause Failure Analysis
Monte Carlo Analysis
and many, many others



Thanks a lot!
Do you think could be a method/tool or best practice that would fit in both groups? For instance, I think that the FMEA method is for failure analysis and prevention.

When you first create the FMEA it is a Failure Prevention tool. As you update it based on actual failures, it can become a failure analysis tool.

And, yes most of the tools in the second list can also be used to determine the cause of an actual failure.

From the first list, the Fault Tree Analysis is the only one that might be used for fault prevention.