1 An actor is a person, organization, or external system that plays a role in one or more interactions with your system. 2  Actors are drawn as stick figures. 3  Associations. 4  Associations between actors and use cases are indicated in use case diagrams by solid lines.
Beauty benefits of walnut oil (Thinkstock photos/Getty Images) High in vitamins and proteins, walnut oil works wonders for your skin. Apart from eating walnuts, the use of it in the form of oil also helps your skin. They are known to be rich in fibre, Omega-3, protein and other vital minerals. Fights wrinkles.
Here are some of the health benefits of eating walnuts: 1  Walnuts have long been known to reduce the risk of heart disease and some cancers. They are one of the best foods to prevent clogged arteries.  They minimize the signs of aging and they are also one of the top 10 foods against wrinkles.