This repository contains an assortment of routines written in IDL for reducing and analyzing multiwavelength imaging and spectroscopy that may prove useful to other astronomers, especially observers. The repository includes iSEDfit, a fully developed Bayesian spectral energy distribution fitting code, and routines for inferring the physical conditions (metallicity, temperature, dust content, etc.)  in star-forming regions based on their optical emission-line strengths, among many other self-contained pieces of code. See also my IDL webpage for updates, documentation, and more details on what is available.  Download the latest version of the repository from github.com: git clone http://github.com/moustakas/impro.git  and add an ${IMPRO_DIR} environment variable to your appropriate startup file. For example, if you use tcsh, add the following line to your .tcshrc file: "setenv IMPRO_DIR /path/to/impro". Finally, add the 'pro' subdirectory to your IDL path, e.g., "setenv IDL_PATH $IDL_PATH{:}+${IMPRO_DIR}/pro"  As usual, the code is provided as-is, with no guarantee of accuracy or success. However, if you are interested in contributing actively to impro send me a note!