There are many different models floating around that are suggested to be used in education. You should use this one because it develops student agency; use this one because it increases productivity; use this one because it will help with digital technologies.
All models have both positives and negatives to it's use. You need to look at each model carefully to figure out if it is right for you, your students and your classroom.
Check out this slide deck that was used to help crowd source information on the T3 model at the #SYD19 Google Innovator Academy (thanks Anthony Speranza for setting it up). It shares with you some ideas on how each of the stages can be implemented and used in your classroom with brief explanations.
Mrs Priestley ICT blog is a place to read, download and view ideas!