The linear collider requires a detector with excellent performance to fully exploit its physics potential. In particular, requirements from the measurement of hadronic jet energies indicate a goal of developing the calorimeter with an unprecedented jet energy resolution. In order to meet this challenge, novel technologies and reconstruction techniques are being developed, which need to be tested with particle beams. The recent decision by the International Technology Recommendation Panel (ITRP) concerning the linear collider accelerator technology imposes a time scale of at most a few years for the basic detector design choices. A vigorous test beam program over the next few years is necessary to provide a solid basis for these decisions. In this regard, the International Linear Collider Calorimeter and Muon Detector Test Beam Group submit this planning document to Fermilab. The main goals of the test beam program outlined in this document are to evaluate the different choices of technologies proposed for the calorimeter and to understand, validate and improve the Monte Carlo modeling and simulation of hadronic showers. This document contains a description of fourteen distinct calorimeter and muon detector/tail-catcher groups and their requirements for specific test beam resources. This planning document also lays out time scales and institutional responsibilities for the proposed test beam program. It provides plans for the users of the Fermilab Meson Test Beam Facility, and needs for upgrades to particle energy ranges and intensities, and associated engineering and computing support services.
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