Interface Control Document

You can use an Interface Control Document to describe the relationship between system components in terms of data items and messages passed, protocols observed and timing and sequencing of events. Interface Control Documents (ICD) are a key element of systems engineering as they define and control the interface(s) of a system, and thereby bound its requirements.
Use the Interface Control Document to:

• Describe the interface to a system or subsystem.
• Describe the inputs and outputs of a single system, the interface between two systems, the interface protocol from the lowest physical elements to the highest logical levels.
• Describe how to access the functions and services provided by a system via an interface.
• Include information about the size, format, and data.
• Provide a structured way to communicate information about subsystems interfaces between different design teams.

Table of Contents

1 Introduction
1.1 Purpose
1.2 Scope
1.3 System identification
1.4 Operational agreement
2. Interface definition
2.1 System overview
2.2 Interface overview
2.3 Operations
2.4 Data transfer
2.5 Transaction types
2.6 Data exchanges
2.7 Precedence and criticality
2.8 Communications methods
2.9 Performance requirements
2.10 Security
3. Interface Requirements
3.1 Interface # Requirements
3.2 Interface # Requirements
4 Interface Verification
5 Interface Control

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