Step in system design; for example, selecting functional units, assigning their locations, and defining their interconnections.
Sources:
NIST SP 800-82r3 under Configuration (of a system or device)

  The possible conditions, parameters, and specifications with which an information system or system component can be described or arranged.
Sources:
NIST SP 1800-27C under Configuration from NIST SP 800-128
NIST SP 800-128 under Configuration
NIST SP 800-128

  The possible conditions, parameters, and specifications with which an information system or system component can be described or arranged. The Device Configuration capability does not define which configuration settings should exist, simply that a mechanism to manage configuration settings exists.
Sources:
NIST SP 800-213 under Configuration from NIST SP 800-128 - Adapted
NISTIR 8259B under Configuration from IoT Safety Architecture and Risk Toolkit v4.0 - Adapted

  The selection of one of the sets of possible combinations of features of a system.
Sources:
NISTIR 5153 under Configuration from ITSEC Ver. 1.2

  “The possible conditions, parameters, and specifications with which an information system or system component can be described or arranged.” The Device Configuration capability does not define which configuration settings should exist, simply that a mechanism to manage configuration settings exists.
Sources:
NISTIR 8259A under Configuration from NIST SP 800-128