The following extract has been taken from a guide for requirements elicitation: Advantages: Gives direct access to the working environment; provides valid in-depth understanding; exposes tacit…

The following extract has been taken from a guide for requirements elicitation: Advantages: Gives direct access to the working environment; provides valid in-depth understanding; exposes tacit knowledge. Disadvantages: Time-consuming, expensive; may affect the situation and hence the requirements elicited. Which elicitation method is being referred to in the extract?