# Agile Stage-Gate Approach for Design, Integration, and Testing of a 1U CubeSat
## 2 Materials and Methods
### Work Breakdown Structure (WBS)  
This section describes details of the project structure of AztechSat-1 and lists an overview of each subsystem based on NASA's Procedural Requirements [20]:  
01: Project Management: This task involves managing the planning, organization, coordination, analysis, control, and approvals of administrative operations to sustain the feasibility of the project. The subsystem works as an agent to review and prepare documentation and also controls facilities that do not belong to the project. This stage excludes technical planning.  
02: System Engineering: This task involves handling and managing all technical aspects of the project. This subsystem oversees defining the space vehicle; the ground system; and all design, software, manufacturing, system architecture, testing, and planning. This subsystem's team also works as an agent to review and prepare documents focused on engineering tasks such the master plan for verification and validation (V&V) and the Interface Control Document (ICD).  
03: Safety and Assurance: All safety and assurance efforts are controlled by this subsystem. This subsystem's team focuses on failure criteria aimed at ensuring that the spacecraft,  
Figure 2: AztechSat-1 communication block diagram.  
ground system, payload, and mission operations meet the necessary requirements. This subsystem does not support suppliers or subcontractors.  
04: Science and Technology: This subsystem includes the management and control of scientific research. Specific responsibilities include defining science requirements and providing algorithms for data processing and analysis. The payload is not considered in this element.  
05: Payload: The main mission of this subsystem is to design and implement the hardware and software payload of the mission and includes the experimental functions of data collection on board as well as the demonstration of intersatellite communication technology for the mission.  
06: Spacecraft: The attitude determination and control subsystem (ADCS) and Mechanical Structure, Power Electronics, Flight Software, and Thermal Control subsystems are all included in this block.  
07: Mission Operation: The implementation of human resources, procedures, and training necessary to carry out the mission operation is managed by this block. This element includes tracking, reception, telemetry, and system state analysis of the mission.  
08: Launch Vehicle: Analysis of the launch vehicle is included in this block. All activities related to the launch operation, service, vehicle, and associated ground teams are controlled by this subsystem.  
09: Ground Segment: The installation, implementation, and control of the ground facilities to send and receive data through the satellite to the Earth station communication system are controlled by this subsystem. This subsystem includes all design, development, assembly, and testing necessary for the ground support equipment to deliver full system integration with the spacecraft.  
10: Integration and Testing: The Integration and Testing team is responsible for understanding each system on the space vehicle (AztechSat-1) and how it is interconnected with every subsystem. This team must have full knowledge of the satellite to understand its design, schematics, operations, manufacturing, testing, and flight. The goal of the team is to ensure that the AztechSat-1 cargo interfaces successfully with the destination (space station) and, thus, ensure the success of the mission. This subsystem also handles the hardware, software, procedures, and facilities of the project required to perform integration and testing of the systems.  
11: Education and Divulgation: All educational and divulgation information is managed by this team. This block also includes marketing, media support, and public web pages.