CMSC243: Assignment 5: Context Diagram
You will submit the paper, Lastname_Firstname_context.docx in Blackboard
under assignments.
Continuing Case: Online Tutors, Inc.
Online Tutors, Inc. provides Online tutoring. They are doing well with
scheduled tutoring sessions, but would like to offer on demand tutoring in
addition.
Online Tutors’ president, Mary Montgomery, sent a letter to IT consultant,
Julie Martin, to help develop the system for the new services. During the
project, Julie will work closely with Ryan Lewis, who manages Online
operations. You, as an intern will assist Julie. You are eager for the chance to
make a good impression in your first professional job.
Background
Julie Martin has completed a preliminary investigation and performed the
fact-finding tasks described in Chapters 2 and 4. Now, she will use the
results to develop a logical model of the proposed information system.
The following is scenarios roposed as possible results of the new system:
Jennifer and Jake Lombard is one of the families that subscribe to
OnlineTutors.
They are the parents of two children: Carla is 8 and Michael is 9.
Carla takes a piano lesson from Steve Fabio every Thursday from
4:00pm to 5:00pm
Steve Fabio is a music teacher in an elementary school and tutors
several students for Online Tutors.
He can tutor in piano, guitar and violin.
Recently, Michael was struggling with long division.
Jennifer searched through the available math tutors and found that
Mark Davis was available right then.
She sent a tutoring request to Mark and Mark sent her a link to a
Zoom session.
Mark worked with Michael for 45 minutes on long division.
Mark Davis is a high school math teacher and can tutor in math for all
grades K to 12.
The Banks family (John and Helen) has scheduled a French lesson for
their two children.
Sandy and Robin three times a week (Monday, Wednesday and Friday)
from 1:00 to 2:00 with …
Madame Thérèse Defarge, a tutor who is a native French speaker.
Pat Murphy has scheduled a weekly computer class for her son Bryan
who is a high school student.
Peggy Burke who is a computer programmer will tutor him Monday
morning from 9:00am to 10:00am.
Peggy tutors in computer basics, Microsoft Office, C++, Java and
Python.
Recently, Bryan had a question and sent a request for an appointment
that afternoon to discuss a C++ program.
Peggy responded that she would meet him at 4:00pm and sent a
Zoom link. They talked on Zoom for 30 minutes.
In addition, each family has an id, an email, and a credit card on file. Each
tutor has an id, an email, and bank information to make payments.
Tasks
Create a professional looking document to address the issues noted below.
Be sure that you have corrected all spelling and grammar errors and clearly
label all sections of the report.
Use the information given above, and review the previous information given
about the proposed system.
1. Prepare a context diagram for the new system.
2. Prepare a diagram 0 DFD for the new system.
3. Create a Data Dictionary to show the data elements, data flows, data stores
and processes for the new system using the information in the sample
scenarios above. This should match the DFD. Include at least 3 specifications
about the format of the data.
Example: Patient Portal: Assignment
Requirements:
The score will be zero if you are not met any of the following requirements:
Submit the Assignment as a Word Document.
There is a heading with your name and description of the assignment at
the top.
The assignment addresses the request from Mary Montgomery.
Item Points
Label every section of the assignment clearly. 3
Layout is clear and easy to read. 3
There are no spelling or grammar errors. 4
Context diagram shows all users and name of system. 6
Data Flow Diagram is correct 6
Label all arrows in Data Flow Diagram. 4
Data dictionary shows all data flows. 4
Data dictionary shows all data stores. 4
Data dictionary shows all processes. 4
Include at least 3 specifications about the format of the
data.
6
Grids are not showing in the diagrams, and screen shot is of
only the diagram.
2
Notation is correct, symbols are consistent size, and lines
are straight.
4
