L-shaped matrix: Basic two-dimensional table showing the relationship between two factors.
T-shaped matrix: Extends the L-shaped matrix to three factors (e.g., rows, columns, additional information at intersections).
X-shaped matrix: Analyzes the interrelationship of four groups of factors (e.g., balancing quality, cost, time, and risk).
Y-shaped matrix: Shows the bidirectional relationship among three groups of factors (e.g., interaction of suppliers, products, and customers).

Relationship Analysis: Reveals the correlation between factors (e.g., matching tasks and resources, corresponding issues and causes).
Comparison Display: Horizontally or vertically compares data differences (e.g., sales data comparison by region and product category).
Priority Sorting: Marks importance through symbols or numerical values (e.g., high/medium/low risk in risk assessment matrices).
Decision Support: Assists in multidimensional decision-making (e.g., product portfolio selection, investment project evaluation).

Multidimensional Analysis: Supports analysis from two-dimensional to four-dimensional and even three-dimensional space relationships, adapting to problem scenarios of varying complexity.
Relationship Visualization: Quantifies relationship strength through symbols or numerical values, avoiding the omission of key corresponding relationships.
Focus on Key Points: Quickly identifies key areas or factors to prioritize control based on intersection data, improving problem-solving efficiency.

1. Comprehensively list all factors related to the problem through brainstorming, data statistics, or expert judgment.
2. Choose the appropriate matrix type based on the number of factor groups, such as using an L-shaped matrix for analyzing product characteristics and test items.
3. Use symbols (e.g., ●, ○, △) or numerical values (e.g., 1-5 points) at matrix intersections to indicate the degree of association between factors.
4. Identify high-association factors to determine key areas or issues that require priority control.
5. Formulate specific control plans or improvement measures for key factors.

The RACI matrix is ​​a responsibility assignment matrix used to clearly define the responsibilities and involvement of each role in a project or process.
The four letters in the RACI matrix represent different roles and responsibilities:
R (Responsible): The specific person responsible for executing the task, who is required to complete specific action items.
A (Accountable): The person, usually a single person, who is accountable for the results of the task. They have the final decision-making authority and are responsible for completing the task. The project can only proceed after approval or sign-off.
C (Consulted): People who need to be consulted during the task execution; their opinions and suggestions have a significant impact on the task's completion.
I (Informed): People who need to be informed of the progress and results of the task. They are generally not directly involved in the task execution, but need to be aware of the relevant information.