こてつ（KOTETSU）

The QA network is an analytical method that organizes quality assurance items and process steps into a matrix to identify and score which steps in the process prevent defects from occurring and being passed downstream. To make it easy for first-time users to understand, we will explain its purpose, benefits, steps for creation, and scoring criteria with concrete examples.

It is a table that organizes the flow from material reception to product shipment, summarizing management items, methods, and procedures for handling abnormalities. This guide consolidates the essential knowledge beginners need to understand the purpose of creating a QC process chart, specific format examples, and step-by-step instructions for making one.

DRBFM (Design Review Based on Failure Mode) is an analytical method designed to identify potential risks and mitigation strategies by focusing on changes from existing designs or processes. The goal is to eliminate risks during the design stage, ensuring high-quality outcomes. This guide explains what DRBFM is, highlights its benefits, and provides step-by-step instructions, including practical examples, to help you implement it effectively. Whether you're a beginner or looking to refine your approach, this article is tailored to make the process clear and actionable.

The process capability index is a quantification of the capability to make products within specifications. This section explains the difference between typical indices Cp and Cpk, the advantages of quantifying, how to calculate, and a guide to judging the values.

FMEA is an analysis method for ranking possible product failure modes in advance, visualizing high-scoring items, and determining policies and priorities for countermeasures.

FTA analysis is an analytical method used to comprehensively investigate causes by creating a tree diagram that starts with a top-level failure event and breaks down the failure causes into hierarchical layers. This guide explains the structure of FTA, the steps for creating it, key points to consider, and the differences between FTA and FMEA, using specific examples to make it easy for beginners to understand.