The James Webb Space Telelscope carries 4 science instruments: the Mid-Infrared Instrument (MIRI), the Near-Infrared Camera (NIRCam), the Near-Infrared Spectrograph (NIRSpec), and the Fine Guidance Sensor / Near InfraRed Imager adn Slitless Spetrograph (FGS/NIRISS). All four instruments are housed in the Integrated Science Instrument Module (ISIM).