Presented for the special educator are some concepts and procedures used in systems analysis, a relatively new study area used in many fields to structure knowledge, to analyze problems, and to suggest and test solutions. (MC)

A brief survey of the mathematics involved in the theory of educational testing. (MM)

Author funded by grants from the National Science Foundation and the Consilium for African Studies of Yale University. Research undertaken with the cooperation of the Institute of Ethiopian Studies of Haile Selassie I University. (VM)

Results indicated that a) the understanding of the conceptual schemes of relativity depended on grade level and on ability level within a grade, b) achievement decreased with increase in taxonomic level, and c) achievement was better in classical relativity than in special or general relativity. (Authors)

Four cooperative library system models are identified: a) bilateral exchange, b) multilateral pooling, c) dual-service common-output, d) service-center or facilitating participant; a) and d) are considered in detail. (Author/DH)

Although there are many different approaches to teaching nutrition, food grouping systems have become an almost universal tool. This article is a detailed comparison of food grouping systems in use in 47 countries. (BL)

Written in Spanish, this article discusses the linguistic condition of the Spanish language among the Mexican American population today. (NQ)

Specific aspects of the thesaurus treated in this brief review are: thesaurus as a concept, classification and structure, and language compilation and control. (75 references) (NH)

Memory span of symbol strings decreased as string length or number of different symbols composing the strings increased. Recall of digit strings was a function of string length only. (Author)

Author defines five communication systems: graphic code, idea code, word code, alphabetical code, and electronetic code. Illustrative slides are available at cost from the author. (SP)

Paper presents a model of the processes involved in listener response to deductive arguments. (Editor)

A taxonomy of: (1) knowledges, (2) attitudes, (3) activities, and (4) status characteristics and research efforts to develop and validate objective measures of vocational maturity variables are suggested. (MU)

Procedures for coordinate indexing are described and the importance of a controlled vocabulary common to indexer and searcher discussed. (Author)