In the 'ADDIE' model of instructional design, the letter 'A' stands for:

Which of the following are correctly identified as part of the 'Nine Events of Instruction' proposed by Gagne? 1. Gain attention 2. Inform learners of objectives 3. Assess prior learning only at the end 4. Provide learning guidance

Arrange the following instructional design models in approximate chronological order of their initial development: 1. ADDIE Model 2. Dick and Carey Model 3. Gagne's Nine Events 4. ASSURE Model