Before using wāw, test four matters: (1) Are there two independent judgments? (2) What is each clause doing—reporting or directing? (3) How do the two subjects and predicates relate? (4) Would coordination create a false attachment or scope?
If the later clause merely explains the former or answers an implied question, the earlier principles of faṣl apply. Distinct, suitably related judgments favor waṣl, but formal similarity is not the final test.