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We present SIPGI, a spectroscopic pipeline to reduce optical/near-infrareddata from slit-based spectrographs. SIPGI is a complete spectroscopic datareduction environment which retains the high level of flexibility and accuracytypical of the standard "by-hand" reduction methods but is characterized by asignificantly higher level of efficiency. This is obtained by exploiting threemain concepts: $i)$ the instrument model: at the core of the data reduction isan analytic description of the main calibration relations (e.g. spectralocation and wavelength calibration) that can be easily checked and adjusted ondata using a graphical tool; $ii)$ a built-in data organizer that classifiesthe data, together with a graphical interface that helps in providing therecipes with the correct input; $iii)$ the design and flexibility of thereduction recipes: the number of tasks required to perform a complete reductionis minimized, while preserving the possibility of verifying the accuracy of themain stages of data-reduction process with provided tools. The current versionof SIPGI manages data from the MODS and LUCI spectrographs mounted at the LargeBinocular Telescope, and it is our plan to extend SIPGI to support otherthrough-slit spectrographs. Meanwhile, to allow using the same approach basedon the instrument model with other instruments, we have developed SpectraPy, aspectrograph independent Python library working on through-slit spectra. In itscurrent version, SpectraPy produces two-dimensional wavelength calibratedspectra corrected by instrument distortions. The current release of SIPGI andits documentation can by downloaded fromhttp://pandora.lambrate.inaf.it/sipgi/, while SpectraPy can be found athttp://pandora.lambrate.inaf.it/SpectraPy/.

SIPGI: an interactive pipeline for spectroscopic data reduction