Process Performance Measurement Series Issue 2: Process Cost Analysis — The Economic Account Behind a Process Diagram

Introduction

In the previous issue, we established a three-dimensional framework for process performance measurement — efficiency, quality, and cost. Among these three dimensions, the cost dimension is often the most overlooked, yet it is the one that receives the most attention from management.

Why? Because any management action taken by a company ultimately needs to answer one core question: Is this investment worth it?

The greatest challenge in process management lies precisely here: optimizing processes requires investment in manpower and time, upgrading IT systems requires funding, and organizational restructuring requires management support — all these actions require "spending money," but the benefits of process optimization are difficult to quantify.

In this issue, we will break down the systematic analysis methods for process costs, helping you to "settle the process account" and provide a solid basis for process optimization.

1. The Comprehensive View of Process Costs: More Than Just "How Much Was Spent"

Process costs are not simply "how much was spent on this task." A complete process cost analysis needs to be conducted at three levels.

Level One: Direct Operating Costs

This is the most superficial and easiest cost to focus on — the direct resource inputs required to maintain process operations.

Level Two: Failure Costs — The Price of "Process Errors"

Failure costs often account for the largest proportion of total process costs, yet they are the easiest to hide from view.

• Internal Failure Costs: Costs incurred for correcting errors discovered during process execution

  • Incorrect forms returned for re-filling, incorrect purchase orders requiring modification
  • Production rework, scrap, and re-inspection
  • Approval processes returned for re-submission due to incomplete information

• External Failure Costs: Losses caused by process errors being passed to customers or downstream stages

  • Customer penalties due to delayed delivery
  • Returns and claims due to quality issues
  • Hidden losses (customer churn) from decreased customer satisfaction

Level Three: Opportunity Costs — The Hidden Losses of "Too Slow Processes"

This is the cost item that is most easily overlooked — the missed business opportunities due to low process efficiency.

• A new customer quotation process takes 3 days, and the customer chooses a competitor because they cannot wait
• The product development process has a long approval chain, missing the market window
• The payment process cycle is too long, and suppliers are unwilling to offer more favorable credit terms

Key Insight: Although opportunity costs are difficult to measure precisely, in highly competitive industries, their impact often exceeds the total of direct operating costs and failure costs.

2. Quantitative Methods for Process Costs: From Vague to Clear

Method One: Activity-Based Costing (ABC)

Activity-Based Costing (ABC) is the most classic method for process cost analysis. The core idea is:

1. Identify all activities in the process
2. Determine the resource consumption of each activity
3. Allocate resource costs to activities
4. Allocate activity costs to process outputs

Case Study: ABC Analysis of the Purchase-to-Pay (P2P) Process

Key Findings: The approval stage accounts for more than 50% of the cost. If the approval process can be simplified or parallelized, there is significant potential for cost savings.

Method Two: Process Cost Waterfall Chart

Decompose the total process cost into contributions from each stage and visualize it using a waterfall chart. This method is particularly suitable for identifying "cost black holes."

Total Process Cost CNY 180 → Request CNY 31 → Approval CNY 91 → Order CNY 23 → Receipt CNY 12 → Invoice CNY 16 → Payment CNY 8
                                                ↓
                                         Cost Contribution Analysis:
                                         Approval Stage 51%
                                         Request Stage 17%
                                         Order Stage 13%

Method Three: Cost of Quality (COQ)

Integrate process costs with quality losses for analysis, which is the best bridge connecting the "quality" and "cost" dimensions.

Key Principle: When external failure costs are too high, increasing prevention cost investment typically brings a 5～10 times leverage benefit. This principle has proven effective in process optimization.

3. Typical Case Study: Cost Reduction in an Approval Process

Case Background: A manufacturing company's equipment procurement approval process has an average cycle of 12 days, and management complains, "It takes two weeks to approve even a screw purchase."

Current Cost Analysis (ABC Method):

Internal Failure Costs: Returns for re-approval due to incomplete information in the approval stage, approximately 40 orders per month (20%), additional cost CNY 9,400/month

External Failure Costs: Urgent order fees from suppliers due to approval delays, CNY 5,000/month

Total Process Cost: CNY 47,000 + CNY 9,400 + CNY 5,000 = CNY 61,400/month

Optimization Plan:

1. Tiered Approval by Amount: Purchases ≤ 50,000 CNY require only one-level approval, 50,000～500,000 CNY require two levels, and > 500,000 CNY require three levels
2. Introduce an electronic approval system with automatic information validation (reduce returns)
3. Set approval SLAs: Each level of approval should not exceed 4 hours

Post-Optimization Results:

This case study illustrates two key conclusions: First, tiered approval is more economical than a "one-size-fits-all" approach; Second, preventive investment (system automatic validation) has an immediate and significant effect on reducing failure costs.

4. Five Best Practices for Process Cost Analysis

1. Start with a Cost Heat Map, Then Dive into ABC

Do not try to precisely calculate every stage from the beginning. Start with a qualitative assessment to create a cost heat map, and then focus on the "suspect areas" for deeper analysis.

2. Focus on "Small Batch, High Frequency" Processes

Many high process costs come from processes that seem insignificant but occur multiple times daily — such as travel expense reimbursement and office supply requisition. Their single cost is small, but when multiplied by the annual occurrence, the numbers are staggering.

3. Use "Process Cost Rate" for Horizontal Comparison

$$ \text{Process Cost Rate} = \frac{\text{Total Process Operating Cost}}{\text{Process Output Value}} \times 100% $$

This ratio can be used to compare the performance levels of similar processes. For example, the P2P process cost rate for industry-leading companies is approximately 0.5～1%. If your company's rate is 2～3%, it indicates significant room for improvement.

4. Make Failure Costs Visible

Most companies' cost reports only record direct operating costs. It is recommended to separately list quality costs in the monthly business analysis to make failure costs "unavoidable."

5. Link Cost Analysis to Business Value

Do not analyze for the sake of analysis. The ultimate goal of process cost analysis is to answer three questions:

• Which processes have the highest costs? → Identify optimization priorities
• How much can be saved after optimization? → Quantify ROI
• Can the savings create greater value? → Determine whether the investment is worthwhile

5. From "Setting the Account" to "Driving Change"

The value of process cost analysis goes far beyond just producing a cost report.

When a quality manager presents data to management, saying, "Our P2P process approval stage costs CNY 47,000 per month, and tiered approval can save more than half of that" — this data is more persuasive than any management theory.

Process cost analysis, in essence, is about using financial language to articulate management needs. It transforms process optimization from a "management concept" into an "investment decision," providing a quantifiable ROI to support optimization plans.

This is why we say: Process cost analysis is the management account book that quality professionals present to their bosses.

Knowledge code: 3.3.3

Version: v20260529

Author: Quality Think Tank