| Base run | 
A model that is cloned for each instance begun by OptClim: includes built executable(s) | 
| Constraint | 
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| Covariances | 
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| Run | 
an instance of a model known to OptClim | 
| PostRun script(postProcess in some of the code) | 
Script run on completion of the model instance to cause the generation of the simulated observations | 
| PostAll  script | 
used to run the optimisation method when all necessary runs are completed | 
| Scenario | 
Is defined by the base model - its code, inputs.  Example: pre-industrial, post-industrial. | 
| Study | 
The full workflow executed by OptClim for a particular scenario and set of parameters |