What are the big 5 of reading intervention strategies?

Excuse me, could you please elaborate on the "big 5" of reading intervention strategies? I'm particularly interested in understanding the key approaches or methods that are commonly employed to improve reading skills and comprehension for struggling readers. Are these strategies research-based, and what specific techniques do they entail? I'm looking for a comprehensive overview that can guide me in designing an effective intervention plan for my students. Thank you in advance for your insights.