Rodrigo needs his sister Alisa to help him make a model of human heart for the upcoming science exhibition in his school. However, he is not sure if she will oblige. So, he initially urges Alisa to accompany him to the arts and crafts supply store to buy materials for the model. A day later, when she appears interested in the project, Rodrigo asks Alisa if she would help him complete the model. Alisa readily agrees to this proposal. In the context of persuasion, this scenario exemplifies .