NGOMSL

can be used to estimate learning time and execution time
assumed knowledge of execution of operators
has limitations -- assumes linear tasks
in 1994, only GOMS model to predict both performance and learning time

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Notes:

1. stipulation is that only the time for learning procedure steps in a specific learning situation is taken into account

2. the quantitative predictions of learning and execution times are only meaningful if the user knows how to use the operators involved

3. if new operators are involved, GOMS analysis can predict only the time required to learn the procedures that use the operators but not the time it would take to learn the new operators themselves

4. the procedure learning time is approximately linear with the number of NGOMSL statements that must be learned (can count the number of statements and multiply)