A project often starts with obtaining a better overview of and insight into the problem. When does grandma feel lonely, and when does she not? What does grandma say she wants? You want information from the application context - the situation in which the solution will be applied. Overview in the application context? Then you arrive at the Field strategy. You could interview grandma. If you decide to use a method, do check the best practices to do it right (Library strategy!). You do not just want to drink a cup of tea with grandma. You also want to make sure you get answers to your questions. For an interview, you could, for example, create a topic list. To do this, again you could use a method from the Library strategy: what is already known to contribute to the feeling of loneliness in the elderly? Perhaps it includes some topics to also ask grandma about? And, if you are already at the retirement home, you could also interview a couple of other grandmas, to see if you can create a solution that could help more than one person.