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.
Walnuts are high in omega-3 fatty acids, a healthy type of fat. Olive oil is considered a healthy fat since it can lower bad cholesterol and contains antioxidants. Soft gel capsules made with concentrated fish oil are an excellent source of omega-3 fatty acids.