OTD and Delivery Reliability — Building Delivery Capability from "On-Time Shipment" to "Trustworthy Commitment"

One, OTD is More Than Just "On-Time Shipment"

OTD (On-Time Delivery, On-Time Delivery Rate) is one of the most frequently mentioned KPIs in manufacturing enterprises. However, many companies' OTD measurement methods have a significant gap compared to the actual customer experience:

• Warehouse scans out on the commitment date at 23:59 → counted as "on-time"
• Customer cannot go online due to missing parts, wrong parts, or incomplete documentation → experienced as "not on-time"
• Internal planning dates are continuously "pushed back" → OTD appears to be consistently above 95%
• Sales commitments to customers are completely disconnected from factory planning → customer trust continuously erodes

Delivery Reliability goes a step further than OTD: it answers the question — Can the customer trust your commitment? Is each commitment consistently fulfilled? Is the variability controllable?

This article discusses, from a quality and operations collaboration perspective, how to build a system of "Trustworthy Commitment → Reliable Execution → Verifiable Delivery."

Two, Three "Measurement Pitfalls" of OTD

Before making improvements, it is essential to unify the measurement criteria. There are three common definitions of OTD:

Recommendation: Report Customer OTD externally, linked to customer SLAs; internally, break it down into three layers: planning achievement, production achievement, and shipment achievement, and manage them separately.

Data Integrity Check:

• Is there a single source for commitment dates (CRM/ERP order confirmation)?
• Does "on-time" include accurate quantity, quality compliance, and complete documentation?
• Are delays caused by customer reasons excluded (written evidence required)?

Without unified criteria, all OTD improvements are like "building a house on sand."

Three, The Delivery Reliability Pyramid

        ┌─────────────────────┐
        │  Customer Trust and  │  ← Final Outcome
        │  Repeat Purchase Rate │
        ├─────────────────────┤
        │  Commitment Accuracy  │  ← Sales/Planning Commitment to Customers
        │  and Transparency     │
        ├─────────────────────┤
        │  Execution Stability  │  ← Production/Supply Chain Fulfillment Capability
        │  (OTD)               │
        ├─────────────────────┤
        │  Plan Credibility     │  ← Ability to Make Reliable Plans
        │  (ATP/CTP)           │
        ├─────────────────────┤
        │  Data and Process     │  ← Master Data, BOM, Inventory, Capacity
        │  Foundation           │
        └─────────────────────┘

A weak foundation leads to a false top. If the BOM is inaccurate, inventory records do not match reality, and standard working times are unrealistic, a high OTD at the upper levels is just a "numbers game."

Four, From Commitment to Delivery: End-to-End Key Control Points

4.1 Order Commitment (Order Promising)

Common Issues:

• Sales "accept orders first and then pressure the factory"
• Planning does not participate in lead time reviews, commitments are based on experience
• Different lead times for standard products, custom products, and new products are not distinguished

Improvement Points:

• Establish ATP/CTP (Available to Promise / Capable to Promise) rules: the system or rule table provides the available commitment range, sales can commit independently within this range, and any commitment beyond it requires joint approval from planning and production
• Distinguish between standard lead time, expedited lead time, and custom lead time with clear premium and resource allocation rules for each
• After order confirmation, the commitment date is written into a single system field, and any subsequent changes require a change process and notification to the customer

4.2 Master Planning and Scheduling (MPS/MRP)

Common Issues:

• Frequent order insertions, "all orders are urgent"
• Unreasonable MRP calculation parameters, suggested purchase/production dates are not actionable
• Disconnection between planners and shop floor information

Improvement Points:

• Set a planning freeze period (Frozen Period): for example, no arbitrary changes to the plan within the next 2 weeks, and insertions follow an exception process
• Weekly S&OP or sales and operations coordination meetings to align demand, capacity, and materials, and output a consensus-based master plan
• Measure planning achievement rate separately and analyze it in conjunction with OTD — is poor OTD due to planning issues or execution issues?

4.3 Material Availability

The primary root cause of OTD failure is often material shortages, not slow production.

Key Indicators:

• Material Availability Rate: the percentage of required materials available by the planned start date
• Material Shortage Waiting Time: hours of waiting due to material shortages
• Supplier On-Time Delivery Rate (Supplier OTD)

Improvement Points:

• Establish safety stock and dual-source strategies for critical materials
• Material shortage warning mechanism: T-7, T-3, T-1 tiered warnings
• Incorporate Supplier OTD into supplier performance and quality agreements

4.4 Production Execution

Common Issues:

• Equipment breakdowns, long changeover times, and low first pass yield (FPY) lead to rework and rush production
• Unprotected bottleneck processes and overproduction in non-bottleneck processes cause work-in-progress (WIP) accumulation

Improvement Points:

• Identify and protect bottleneck processes (Theory of Constraints, TOC)
• Conduct correlation analysis between OEE, FPY, and OTD
• Set limits for expedited orders in the "green channel" to avoid常态化破坏节奏 (常态化破坏节奏 can be translated as "routinized disruption of rhythm")

4.5 Shipment and Delivery Closure

Improvement Points:

• Pre-shipment checklist: quantity, labels, certificates of conformity, customer-specific requirements
• Include in-transit logistics time in commitment calculations, rather than "delivery upon factory dispatch"
• Use customer sign-off or EDI confirmation as the OTD closure condition (if data is available)

Five, OTD Diagnosis: Five-Step Root Cause Method

When OTD is below the target (e.g., < 95%), it is recommended to investigate in the following order:

1. Break down OTD losses: categorize by cause — material shortages, capacity, quality rework, plan changes, logistics, customer reasons
2. Pareto Analysis: identify the top 3 causes contributing to 80% of the losses
3. Sample Traceability: select 5-10 delayed orders and create end-to-end timelines (Order Timelines)
4. Cross-Department Workshops: planning, purchasing, production, quality, and sales participate together, no blame-shifting, only data
5. 90-Day Action Plan: each cause corresponds to an owner, actions, and targets

Example Order Timeline Fields:

• Customer order date → committed delivery date → planning issuance date → material availability date → actual start date → completion date → shipment date → customer's required delivery date

An order timeline often explains issues more clearly than ten pages of PPT.

Six, Family of Delivery Reliability Indicators

In addition to OTD, it is recommended to monitor the following indicators:

The core of reliability is "low variability" — customers prefer a stable 14-day lead time over an average 10-day lead time that fluctuates between 5 and 25 days.

Seven, Integration with S&OP

If an S&OP (Sales and Operations Planning) or IBP process is already established, OTD should be one of the five key outputs of S&OP for continuous review:

• Demand Review: Is the demand real and actionable?
• Supply Review: Do capacity, materials, and subcontracting support the demand?
• Contingency Review: If demand exceeds expectations, how can OTD risks be mitigated?
• Financial Impact: Penalties, air freight, and customer churn risks due to delays

S&OP is not just a meeting to go through the motions; it is about digesting uncertainties before making commitments, rather than firefighting after commitments are made.

Eight, Common Misconceptions

Misconception One: Chasing OTD Numbers Without Improving Commitment Mechanisms

Internal plans are constantly pushed back, making OTD always look good. It is necessary to monitor "first commitment achievement rate" simultaneously.

Misconception Two: Pushing All OTD Responsibilities to Production

Material shortages, plan insertions, and overpromising by sales cannot be solely blamed on production. OTD must be a cross-functional, end-to-end metric.

Misconception Three: Ignoring Delivery Quality

On-time but incorrect or missing parts still lead to customer dissatisfaction. The perfect order rate should be gradually introduced.

Misconception Four: Disconnecting OTD from Supplier OTD

If incoming materials are not on time, factory OTD is impossible. Supplier delivery is a prerequisite for OTD.

Nine, 90-Day Rapid Start-Up Recommendations

Month 1: Unify Criteria and Establish Baseline

• Define the formula for calculating Customer OTD
• Pull a sample of delayed orders from the past 6 months and complete cause categorization
• Establish a monthly OTD dashboard

Month 2: Tackle the Top 1 Root Cause

• If material shortages are the main issue: promote material availability rate and Supplier OTD
• If plan insertions are the main issue: promote the planning freeze period and exception process
• If capacity is the main issue: promote bottleneck protection and OEE

Month 3: Pilot Commitment Mechanisms

• Select one product line to pilot ATP/CTP rules
• Joint lead time reviews by sales and planning
• Compare OTD and delivery cycle variability between the pilot and non-pilot lines

What customers remember is not a single "miraculous rush" but your consistent "delivery as promised." OTD is a number, but delivery reliability is the relationship.

Knowledge Number: 4.2.3

Version: v20260627

Author: Quality Excellence Think Tank Quality Excellence Think Tank is dedicated to providing systematic knowledge, methodologies, and practical tools for quality management professionals, helping companies continuously improve their quality capabilities.