Final answer:
A technical implementation guide remains in effect until it is superseded or withdrawn, unless directed by another authority.
Step-by-step explanation:
A technical implementation guide remains in effect until it is superseded or withdrawn, unless directed by another authority. This means that the guide will continue to be valid and enforceable until there is a newer version or until it is officially revoked by a directive.
For example, in the context of a software development project, a technical implementation guide may outline the best practices and guidelines for coding and design. Until a new version of the guide is issued or if a directive is given to withdraw it, the guide will continue to apply to the project.