The summary is the first section of a CoE document, and should be no longer than a few paragraphs.
It should define, in as simple terms as possible, the broad scope of the error and failure that occurred. It should not define solutions, causes or actions - and it must be in a form that all stakeholders, including those not directly involved in the root-cause analysis, can understand and appreciate.
Imagine a CoE that starts with the following first sentence; this can also used as the Subject of an email:
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Everyone should be able to understand the summary. Be brief and to the point and do not diagnose, describe.
The CoE Summary should not be too long. A paragraph or three is the maximum, and if the event can be summarised in a single sentence or two, that is better.
Care should be taken so that the Summary is easy to read and accessible by all - it should contain no jargon or business specific language, and as largely as possible, should avoid reference to internal systems or processes that an outsider would not easily understand.
An external entity, or a customer, should be able to read the summary and understand the context of what is being described.
Explain it like I am five. Everyone should be able to understand this section, and if need be, go no further.
v0.1 22/01/22