Use them all in longer training sessions. Pick and chose for shorter sessions. Use an overview to announce the training event and entice people to attend. Use the big picture again at the first session to establish focus. The overview orients the learners to the learning context and lets them grasp the relationship between the organization, the training and themselves.
Objectives are the specific skills, knowledge or attitudes to be acquired.
Along with the Overview, Objectives can be broadcast via the organization's Intranet in advance. Be aware that soft skills training like leadership or team building are often difficult to measure but they can be described. The title of this column, Guide on the Side, is a metaphor for training. Metaphors and analogies often can be used in conjunction with props. Essentially, they provide a link between the know and the unknown.