When distinguishing between logical process models and physical process models, it is helpful to provide an illustration. A logical model showcases the elements and their connections within the model, whereas a physical model includes all relevant entities and provides details on how to implement the model using a specific object. For example, in a logical model representing a person within a family tree, each node would contain attributes such as name, date of birth, place of birth, etc.
The glacial chart would also show a distinct attribute or combination of attributes known as a primary key that represents exactly one section within this entity. The physical model for the person would include implementation details such as data types, indexes, constraints, and more. The physical model for the individual would contain usage details, including data types, indexes, constraints, and similar aspects. A wealthy businessman possesses numerous paintings that he lends for exhibitions worldwide.
He wants to create a system to track his loans and investments, including information about his paintings and the artists who painted them. He also wants to keep records of the museums that reserve his art and the actual reservations. Artists are linked to paintings, paintings are linked to reservations, and reservations are linked to museums. Which four entities should be included in this data model?
An Entity can be any article, place, individual or class. In an E-R Diagram, an entity is represented using rectangles. Consider a sample of an association. The association includes entities such as Worker, manager, division, item and many more. There are 4 entities in total: 1) Artist, 2) Paintings, 3) Reservations, 4) Museums.
b. Which are some of the basic attributes for each entity? The basic attributes for each of these four entities are as follows:
1) Attributes of Artist: First name, Last name, Age, Phone no, Number_of_paintings
2) Attributes of Paintings: Description, Price
Category Artifact Name Year_completed 3) Attributes of Museums City State 4) Attributes of Reservations Start date End date Number
Joint Application Design (JAD) is a more effective technique for gathering information compared to traditional methods of requirements gathering. However, it does have limitations. The JAD approach leads to faster development times and higher client satisfaction as the client is involved throughout the development process.
The conventional approach to system development involves a designer researching framework requirements and developing an application based on customer data gathered through a series of interviews. RADAR, a variation of JADE, aims to expedite application development by utilizing informal methods and reusing software components. However, one drawback of JADE is that developers may address the wrong application development challenges if they are not adequately prepared for the meetings.
