Veterinary medicine and animal husbandry in Mexico: From empiricism to science and technology

Conclusion Foot-and-mouth disease was the event which led to the increased and improved training of veterinarians able to produce through their research new veterinary knowledge for practical application.It led to the transformation of the Mexican veterinary profession. It changed the kind of knowledge veterinarians received at university, and it also changed the work they did as professionals. Veterinarians gradually began to perform a much wider range of tasks: they did research, taught, worked as civil servants, or assumed positions as academic administrators and as high governmental officials with a large amount of influence on governmental agricultural activities. They also engaged directly in animal husbandry and in food production.In parallel with these changes, the National University, and within it the Faculty of Veterinary Medicine and Animal Husbandry, underwent a concomitant series of changes which ran hand-in-hand with the growth of the Mexican state. The university provided training for specialised research workers by offering scholarships and programmes of graduate study. This consolidated the activities of an academic community working on applied veterinary medicine. The beneficiaries of these efforts take part in and influence, to varying degrees, the planning and programming of agricultural policies in a way that would not formerly have been possible.     

A multiage-grouping success story

How children organize themselves in play reflects groupings found in society. Multiage grouping in schools reflects the same. Multiage grouping is grouping children of multiple ages, at least one year apart, for instruction. With renewed interest in this practice comes anxiety for teachers who contemplate such a change. Some questions teachers often ask include: How do I get started?, and How do I organize the day? This article is the success story of one teacher as she began her multiaged classroom. Perhaps her story can answer some questions and serve as a beginning model for others.     

Twenty years of research on advance organizers: Assimilation theory is still the best predictor of results

Forty-four published research studies involving advance organizers were reviewed. Twenty-seven studies included an advance organizer vs. a control group (standard advance organizer study) and 17 studies included an advance organizer vs. a post organizer group (modified advance organizer study). Results of the studies were compared to the predictions of several theories. In addition, four specific predictions of assimilation theory were evaluated: that advance organizers should have a stronger effect for poorly organized text than for well organized text, that advance organizers should have a stronger positive effect for learners lacking prerequisite knowledge, that advance organizers should have a stronger effect for learners lacking prerequisite abilities, and that advance organizers should have an especially strong effect on measures of transfer rather than retention.     

An assessment of the validity and discrimination of the intensive time-series design by monitoring learning differences between students with different cognitive tendencies

Intensive time-series designs for classroom investigations have been under development since 1975. Studies have been conducted to determine their feasibility (Mayer & Lewis, 1979), their potential for monitoring knowledge acquisition (Mayer & Kozlow, 1980), and the potential threat to validity of the frequency of testing inherent in the design (Mayer & Rojas, 1982). This study, an extension of those previous studies, is an attempt to determine the degree of discrimination the design allows in collecting data on achievement. It also serves as a replication of the Mayer and Kozlow study, an attempt to determine design validity for collecting achievement data. The investigator used her eighth-grade earth science students, from a suburban Columbus (Ohio) junior high school. A multiple-group single intervention time-series design (Glass, Willson, & Gottman, 1975) was adapted to the collection of daily data on achievement in the topic of the intervention, a unit on plate tectonics. Single multiple-choice items were randomly assigned to each of three groups of students, identified on the basis of their ranking on a written test of cognitive level (Lawson, 1978). The top third, or those with formal cognitive tendencies, were compared on the basis of knowledge achievement and understanding achievement with the lowest third of the students, or those with concrete cognitive tendencies, to determine if the data collected in the design would discriminate between the two groups. Several studies (Goodstein & Howe, 1978; Lawson & Renner, 1975) indicated that students with formal cognitive tendencies should learn a formal concept such as plate tectonics with greater understanding than should students with concrete cognitive tendencies. Analyses used were a comparison of regression lines in each of the three study stages: baseline, intervention, and follow-up; t-tests of means of days summed across each stage; and a time-series analysis program. Statistically significant differences were found between the two groups both in slopes of regression lines (0.0001) and in t-tests (0.0005) on both knowledge and understanding levels of learning. These differences confirm the discrimination of the intensive time-series design in showing that it can distinguish differences in learning between students with formal cognitive tendencies and those with concrete cognitive tendencies. The time-series analysis model with a trend in the intervention was better than a model with no trend for both groups of students, in that it accounted for a greater amount of variance in the data from both knowledge and understanding levels of learning. This finding adds additional confidence in the validity of the design for obtaining achievement data. When the analysis model with trend was used on data from the group with formal cognitive tendencies, it accounted for a greater degree of variance than the same model applied to the data from the group with concrete cognitive tendencies. This more conservative analysis, therefor, gave results consistent with those from the more usual linear regression techniques and t-tests, further adding to the confidence in the discrimination of the design.     

Total communication use among elementary teachers of hearing-impaired children

This study examined the degree to which teachers' signed Manually Coded English messages represented their spoken utterances. Results indicate that educators in early elementary programs can, and do, provide a complete manual representation of their spoken English messages. This is in contrast with earlier research with middle school educators and parents of hearing-impaired children. Findings indicate that MCE proficiency may be influenced both by teacher attitude regarding the importance of signing a complete message and the degree to which program supervisors monitor teacher implementation of clearly specified MCE policies. Findings from this study have implications for programs to train teachers in using MCE and also provide information on the effects of program policy on teacher use of sign language.     

Situating teacher inquiry: a micropolitical perspective

Professional learning communities (PLCs) have become a popular strategy in various forms (e.g., data teams, grade-level teams) and with various champions (e.g., district leaders, university researchers, teacher advocates). Although well-implemented PLCs have been shown to distribute leadership, the tension between democratic inquiry processes and the demands of accountability remain understudied. This study asks how teacher inquiry is situated within conflicting school priorities and the impact of competing power structures on PLCs through a case study of a teacher inquiry initiative at 6 urban elementary and middle schools in the US. Data were collected over 3 years of PLC implementation. District officials, principals, reform coaches, and teachers at each setting participated in more than 300 interviews, regular site visits, and annual teacher surveys. The influences of power structures – such as district mandates, accountability pressures, and principal leadership – emerged as strong themes in teacher narratives of what it means to “do” inquiry in their PLCs.