Andrew Roberts, veteran math teacher, instructional coach, teacher trainer and data guy says that there is just no arguing with results when it comes to inquiry-based vs direct instruction.

Resources:

Connect with Figure Math

Angela Duckworth's book - Grit: The Power of Passion and Perseverance

Angela Duckworth's TED Talk on Grit

Carol Dweck's book - Mindset: The New Psychology of Success

Carol Dweck's TED Talk on Mindset