An IAM (Individual Accommodation Module) is a modular berthing system employed by the AWSF, on many different classes of spacecraft. It is defined by standardized dimensions, electrical and ventilation interfaces, and other specifications. IAMs are made by many contractors and have, naturally, been revised and upgraded over the years; this article describes the ones in use on the Zheng He, but they are fairly typical of recent IAMs throughout the fleet. They are also used in stations and fixed installations, and some civilian use thanks to surplus sales.

The IAM is similar to a capsule hotel room. (Indeed, high-density low-cost hotels sometimes purchase surplus IAMs for this use.) It contains a lightweight composite mattress and integrated shelving and storage unit. For freefall use, it includes adjustable straps. Medical telemetry for use as an individual hibernation space is provided for. Additional de facto storage space for flat items is under the mattress, and this is a common place to stash one's emergency EVA gear (excluding, obviously, the helmet and life support pack, which must occupy space in the storage unit.)

The left and right walls of an IAM are removable, allowing a pair of horizontally adjacent IAMs to be merged into a large unit, for the use of couples in appropriate settings. The IAM is high enough for most people to sit up in. The ceiling is equipped with a wavefront display for 3D image display, e.g. of a sky or an entertainment program. The door to the IAM is equipped with an electronic dimming/shutter mechanism. The units have individual temperature control and are equipped with emergency life support supplies, and can serve as a short-term refuge in the event of a pressure-loss casualty provided the module remains in its supporting frame structure.

The IAM has reasonably good soundproofing from outside noise, but has a chime for waking the sleeping occupant if necessary. They have locks, which can be opened by their designated occupant or for security or maintenance purposes.