Every few months someone asks whether ADDIE is "outdated" now that SAM (Successive Approximation Model) exists. It's the wrong question. Both are still in active, successful use; the real question is which failure mode your project can least afford.
ADDIE: linear, and that's the point
Analyze, Design, Develop, Implement, Evaluate. ADDIE gets criticized for being rigid, but rigidity is a feature when a project has firm regulatory requirements, a fixed content scope agreed on by legal or compliance stakeholders, or a large number of approvers who need a predictable review cadence.
- Best when scope is well understood upfront and unlikely to change mid-project.
- Best when sign-off from multiple stakeholders (legal, compliance, exec sponsors) is required at defined checkpoints.
- Weakest when the subject matter is still evolving, or when you don't yet know what "done" looks like.
SAM: iterative, and built for uncertainty
SAM replaces ADDIE's linear phases with short, repeated design-review-revise cycles, often starting with a rough prototype instead of a full design document. It's a better fit when the content itself is still being figured out, or when the fastest way to learn what a course needs is to put something rough in front of learners and SMEs early.
- Best for fast-moving product or sales content where the "right" answer changes month to month.
- Best when you have a small, co-located group of SMEs who can review quickly and often.
- Weakest when stakeholders expect a single formal sign-off rather than continuous feedback loops: iterative review can read as "unfinished" to teams used to waterfall processes.
The framework should absorb your project's actual risk, not just look tidy in a proposal.
How I actually decide
In practice, I ask three questions before picking a model:
- How likely is scope to change once we start building? High likelihood pushes toward SAM.
- How many people need formal sign-off, and how available are they? Many approvers with limited availability pushes toward ADDIE's checkpoint structure.
- What's more expensive to get wrong: building the wrong thing, or missing the deadline? If "wrong thing" is the bigger risk, prototype early with SAM. If "missed deadline" is the bigger risk, ADDIE's predictability wins.
Most real projects end up as a blend: an ADDIE-shaped project schedule with SAM-style rapid prototyping inside the Design and Develop phases. The framework is a tool for managing risk, not a philosophy to be loyal to.