TLA+ is a high-level language for modeling programs and systems. It is useful for eliminating fundamental design errors, which are hard to find and expensive to correct in code.

The TLA Toolbox is an IDE (integrated development environment) for the TLA+ tools. Use it to:

• Create and edit your specs, with the locations of parsing errors
  marked in the modules
• Run the PlusCal translator, with the locations of translation
  errors marked in the PlusCal code
• View the pretty-printed versions of your modules
• Run the TLC model checker.
  The Toolbox allows you to explorer an error trace produced by
  TLC—for example, by evaluating arbitrary formulas at each step
  in the trace
  
• Run the TLA+ proof system