Rogers propounded the third model, which is known as Innovation –Adoption Model. This model has relevance to new product introductions and particularly useful for adoption of non-commercial services or practices in developing countries. The stages of evaluation and trail before adoption (or purchase) are considered significant in the design of advertising program. The decision in favor of making an evaluation is likely to be influenced by information available from various sources including advertising. Evaluation constitutes a major step towards the adoption of the product or service.
I do hope you have gone over the various models and are trying to understand the relevance of them in the context of advertising. It is basically how you register an advertisement after seeing it and the course of action as in the purchase that takes place.