The introduction also points to separation and connection (Faṣl wa Waṣl, فصل ووصل), and brevity and expansion (Ījāz wa Iṭnāb, إيجاز وإطناب).
Faṣl: placing two sentences without a coordinating conjunction when that suits the relation.
Waṣl: joining clauses with an appropriate conjunction.
Ījāz: conveying the full meaning economically.
Iṭnāb: providing useful elaboration when the purpose requires it.
Shortness is not always a virtue, nor is length always a defect. Context gives each technique its rhetorical value.