Classify Techniques by Strategy

(1) System prototyping,Change avoidance

(2) Incremental delivery,Both strategies

(3) Boehm's spiral model,Both strategies

(4) Waterfall model,Neither — plan-driven, requires stable requirements

Explanation

System prototyping: primarily change avoidance. Incremental delivery: both — avoids premature commitment and accommodates changes at low cost in later increments. Spiral model: both — combines change avoidance and tolerance through explicit risk management. Waterfall: neither — it is a plan-driven model best suited when requirements are stable and well-understood.