I came across the ADDIE model when I underwent the WSQ ACTA course some years back. It's a widely used model and here is my take on it based on my limited experience with instructional design.

1. ADDIE
MODEL
Analysis
Design
Develop
Implement Evaluate

2. ANALYSIS
Here, instructional designers identify the
learner profile and identifies the gaps in
learning and performance.
This is where the activities of formal
evaluation begins.

3. DESIGN
A detailed plan of instruction is
developed. Instructional designers
determine instructional strategies, the
medium of instruction and instructional
methods.
Learning outcomes are also decided in
this phase.

4. DEVELOP
This is where the learning materials are
developed. This includes any videos,
slides or audio recordings.
The implementation plan is also revised
as necessary.

5. IMPLEMENTATION
With everything designed and developed,
this phase is where the instructional
system is deployed in operational
conditions.
Feedback on learner performance is
collected in operational evaluation
activities.

6. EVALUATION
Evalution is depicted in the middle of the
illustration because it is a central function
that takes place at every phase.
The evaluation may be formative,
summative or operational.

7. FINAL THOUGHTS
As depicted by the diagram, the ADDIE
model is a cyclical process with a
continuous process of on-going
evaluation and improvement.
The process and products of each phase
are evaluated against the learning
requirements and principles of learning.

8. What questions do you
ask clients to ensure you
can show value and ROI
when using the ADDIE
model to develop
training programmes?