It is suggested that most standardized science tests do not adequately assess the majority of concepts taught as part of the very diversified middle school science curriculum. The 50-item Life Science Test constructed by Portland Public Schools, Maine, herein presented, aims to resolve this inadequacy. The 40-minute multiple choice test incorporates items dealing with: science study skills; community relations; living and non-living factors in the environment; adaptation of the organisms to their environment; terrestrial and marine environment. Directions concerning test administration are provided for the test administrator and instructions for the student are incorporated in the test. The test was administered as a pretest and posttest to more than 300 grade 7 students. Appended to the test sample are the resulting reliability (standardized Alpha) estimates which range between .65 and .73, and a specification table which lists the number of items testing knowledge or recall and comprehension for each concept. (Author/AEF)