Social media analysis or other corroboration of links between potential investigative subjects, and what these can or can’t mean in terms of evidence.

Reading company accounts and other documents to find and verify indicators of corruption.

Keeping data-driven journalism under control.

Finding, recruiting and protecting human sources. Practical information security and physical operational security. Skills for avoiding or mitigating surveillance.

Putting it together. Nailing the facts. Making accusations stick. The workflow. Managing the investigation and writing it up.