| Length of production unit | mean length of clause (MLC) | number of words / number of clauses |
| mean length of sentence (MLS) | number of words / number of sentences |
| mean length of T-unit (MLT) | number of words / number of T-units |
| Sentence complexity | clauses per sentence (C/S) | number of clauses / number of sentences |
| Subordination | clauses per T-unit (C/T) | number of clauses / number of T-units |
| complex T-units per T-unit (CT/T) | number of complex T-units / number of T-units |
| dependent clauses per clause (DC/C) | number of dependent clauses / number of clauses |
| dependent clauses per T-unit (DC/T) | number of dependent clauses / number of T-units |
| Coordination | coordinate phrases per clause (CP/C) | number of coordinate phrases / number of clauses |
| coordinate phrases per T-unit (CP/T) | number of coordinate phrases / number of T-units |
| T-units per sentence (T/S) | number of T-units / number of sentences |
| Particular structures | complex nominals per clause (CN/C) | number of complex nominals / number of clauses |
| complex nominals per T-unit (CN/T) | number of complex nominals / number of T-units |
| verb phrases per T-unit (VP/T) | number of verb phrases / number of T-units |