Skip to main content

Community Repository Search Results

resource project Museum and Science Center Programs
The American Museum of Natural History (AMNH), in collaboration with New York University's Institute for Education and Social Policy and the University of Southern Maine Center for Evaluation and Policy, will develop and evaluate a new teacher education program model to prepare science teachers through a partnership between a world class science museum and high need schools in metropolitan New York City (NYC). This innovative pilot residency model was approved by the New York State (NYS) Board of Regents as part of the state’s Race To The Top award. The program will prepare a total of 50 candidates in two cohorts (2012 and 2013) to earn a Board of Regents-awarded Masters of Arts in Teaching (MAT) degree with a specialization in Earth Science for grades 7-12. The program focuses on Earth Science both because it is one of the greatest areas of science teacher shortages in urban areas and because AMNH has the ability to leverage the required scientific and educational resources in Earth Science and allied disciplines, including paleontology and astrophysics.

The proposed 15-month, 36-credit residency program is followed by two additional years of mentoring for new teachers. In addition to a full academic year of residency in high-needs public schools, teacher candidates will undertake two AMNH-based clinical summer residencies; a Museum Teaching Residency prior to entering their host schools, and a Museum Science Residency prior to entering the teaching profession. All courses will be taught by teams of doctoral-level educators and scientists.

The project’s research and evaluation components will examine the factors and outcomes of a program offered through a science museum working with the formal teacher preparation system in high need schools. Formative and summative evaluations will document all aspects of the program. In light of the NYS requirement that the pilot program be implemented in high-need, low-performing schools, this project has the potential to engage, motivate and improve the Earth Science achievement and interest in STEM careers of thousands of students from traditionally underrepresented populations including English language learners, special education students, and racial minority groups. In addition, this project will gather meaningful data on the role science museums can play in preparing well-qualified Earth Science teachers. The research component will examine the impact of this new teacher preparation model on student achievement in metropolitan NYC schools. More specifically, this project asks, "How do Earth Science students taught by first year AMNH MAT Earth Science teachers perform academically in comparison with students taught by first year Earth Science teachers not prepared in the AMNH program?.”
DATE: -
TEAM MEMBERS: Maritza Macdonald Meryle Weinstein Rosamond Kinzler Mordecai-Mark Mac Low Edmond Mathez David Silvernail
resource project Professional Development, Conferences, and Networks
EvaluATE is a national resource center dedicated to supporting and improving the evaluation practices of approximately 250 ATE grantees across the country. EvaluATE conducts webinars and workshops, publishes a quarterly newsletter, maintains a website with a digital resource library, develops materials to guide evaluation work, and conducts an annual survey of ATE grantees. EvaluATE's mission is to promote the goals of the ATE program by partnering with projects and centers to strengthen the program's evaluation knowledge base, expand the use of exemplary evaluation practices, and support the continuous improvement of technician education throughout the nation. EvaluATE's goals associated with this proposal are to: (1) Ensure that all ATE Principal Investigators and evaluators know the essential elements of a credible and useful evaluation; (2) Maintain a comprehensive collection of online resources for ATE evaluation; (3) Strengthen and expand the network of ATE evaluation stakeholders; and (4) Gather, synthesize, and disseminate data about the ATE program activities to advance knowledge about ATE/technician education. The Center plans to produce a comprehensive set of evaluation resources to complement other services, engaging several community college-based Principal Investigators and evaluators in that process.

EvaluATE's products are informed by current research on evaluation, the National Science Foundation's priorities for the evaluation of ATE grants, and the needs of ATE PIs and evaluators for sound guidance that is immediately relevant and usable in their contexts. The fundamental nature of EvaluATE's work is geared toward supporting ATE grantees to use evaluation regularly to improve their work and demonstrate their impacts. All of EvaluATE's products are available to the public. EvaluATE's findings from the annual survey of ATE grantees aid in advancing understanding of the status of technician education and illuminate areas for additional research. The new survey investigates ATE grantees' work to serve underrepresented and special populations, including women, people of color, and veterans. Survey data are available upon request for research and evaluation purposes.
DATE: -
TEAM MEMBERS: Lori Wingate Arlen Gullickson Emma Perk Kelly Robertson Lyssa Becho
resource project Media and Technology
WGBH Educational Foundation will create PEEP'S WORLD/EL MUNDO DE PEEP, a Web-based "Digital Hub," in both English and Spanish, to significantly increase the impact of the extensive collection of proven preschool science and math assets from the Emmy Award-winning TV show PEEP AND THE BIG WIDE WORLD®. This project will: (1) redesign the PEEP Web site, creating interactive media experiences that will contextualize existing content and take advantage of new Web design; (2) provide professional development for preschool educators; and (3) reach a new audience of family childcare educators, one that is woefully underserved when it comes to educational resources about science. Dissemination through a network of national organizations, including National Association of Family Child Care, National Association of Child Care Resource and Referral Agencies, National Head Start Association, National Education Association, AVANCE, and Committee for Hispanic Children and Families, will help engage the maximum number of educators and parents in the project. PEEP'S WORLD/EL MUNDO DE PEEP will provide resources for targeted audiences. Specifically these resources will provide: Children with multiple ways to engage with science or math content areas, including interactive games, animated stories, and live-action videos; Parents with guided experiences to facilitate their child's math and science play; Center-based preschool educators with a media-rich, year long science curriculum and professional development materials; and Family childcare educators with curriculum modules, integrated with media, focused on six science content areas, and professional development materials for home-care settings in English and in Spanish. The University of Massachusetts's Donahue Institute will conduct a formative evaluation of the family childcare educator resources: 200 Spanish-speaking and 200 English-speaking educators will pilot the curriculum modules and professional development videos. Concord Evaluation Group, Inc. will conduct a summative evaluation, consisting of a Family Web Site Experiment and a National Observational Study, to assess the extent to which the project is successful at achieving its intended impacts. A multifaceted national dissemination plan will include a robust social media strategy, implemented by a Spanish-speaking online community manager, to reach parents, and collaborations with early childhood education statewide systems to reach educators. The projects intended impacts are to: (1) help English- and Spanish-speaking preschoolers effectively apply science and mathematical inquiry and process skills; (2) empower English- and Spanish-speaking parents to feel more equipped and inclined to facilitate science and math exploration with their preschoolers; and, (3) provide center-based and family childcare educators with resources for incorporating math and science into their curricula and boosting their confidence in teaching these subjects. While many parents know how to read to their children, they do not typically know how to approach science or math investigations with their pre-schoolers. After parents, preschool educators are the most important promoters of a young child\'s learning. Yet, center-based and family childcare educators do not receive significant training in science, and thus lack confidence when conducting preschool science activities. By providing parents and educators resources for approaching preschool science and math, which meet their specific needs, PEEP will help alleviate these challenges.
DATE: -
TEAM MEMBERS: Marisa Wolsky Kate Taylor
resource project Media and Technology
This full scale research and development collaborative project between Smith College and Springfield Technical Community College improves technical literacy for children in the area of engineering education through the Through My Window learning environment. The instructional design of the learning environment results from the application of innovative educational approaches based on research in the learning sciences—Egan's Imaginative Education (IE) and Knowledge Building (KB). The project provides idea-centered engineering curriculum that facilitates deep learning of engineering concepts through the use of developmentally appropriate narrative and interactive multimedia via interactive forums and blogs, young adult novels (audio and text with English and Spanish versions), eight extensive tie-in activities, an offline teachers’ curriculum guide, and social network connections and electronic portfolios. Targeting traditionally underrepresented groups in engineering—especially girls—the overarching goals of the project are improving attitudes toward engineering; providing a deeper understanding of what engineering is about; supporting the development of specific engineering skills; and increasing interest in engineering careers. The project will address the following research questions: What is the quality of the knowledge building discourse? Does it get better over time? Will students, given the opportunity, extend the discourse to new areas? What scaffolding does the learning environment need to support novice participants in this discourse? Does the use of narrative influence participation in knowledge building? Are certain types of narratives more effective in influencing participation in knowledge building? Evaluative feedback for usability, value effectiveness, and ease of implementation from informal educators and leaders from the Connecticut After School Network CTASN) will be included. The evaluation will include documentation on the impact of narrative and multimedia tools in the area of engineering education. Currently, there is very little research regarding children and young teen engagement in engineering education activities using narrative as a structure to facilitate learning engineering concepts and principles. The research and activities developed from this proposed project contributes to the field of Informal Science and Engineering Education. The results from this project could impact upper elementary and middle-school aged children and members from underrepresented communities and girls in a positive way.
DATE: -
TEAM MEMBERS: Beth McGinnis-Cavanaugh Glenn Ellis Alan Rudnitsky Isabel Huff
resource project Public Programs
The University of Alaska Fairbanks will partner with the National Optical and Astronomy Observatory, the University of Alaska Museum of the North, and the University of Washington-Bothell to bring biomaterials, optics, photonics, and nanotechnology content, art infused experiences, and career awareness to art-interested girls. This full scale development project, Project STEAM, will explore the intersections between biology, physics, and art using advanced technologies at the nano to macro scale levels. Middle school girls from predominately underrepresented Alaskan Native, Native American (Tohono O'odham, Pascula Yaqui) and Hispanic groups, their families, teachers, and Girl Scout Troop Leaders in two site locations- Anchorage, Alaska and Tucson, Arizona will participate in the project. Centered on the theme "Colors of Nature," Project STEAM will engage girls in science activities designed to enhance STEM learning and visual-spatial skills. Using advanced technologies, approximately 240 girls enrolled in the Summer Academy over the project duration will work with women scientist mentors, teachers, and Girl Scout Troop Leaders to create artistic representations of natural objects observed at the nano and macro scale levels. Forty girls will participate in the Summer Academy in year one (20 girls per site- Alaska and Arizona). In consequent years, approximately180 girls will participate in the Academy (30 girls per site). Another 1,500 girls are expected to be reached through their Girl Scout Troop Leaders (n=15) who will be trained to deliver a modified version of the program using specialized curriculum kits. In addition, over 6,000 girls and their families are expected to attend Project STEAM Science Cafe events held at local informal science education institutions at each site during the academic year. In conjunction with the programmatic activities, a research investigation will be conducted to study the impact of the program on girls' science identity. Participant discourse, pre and post assessments, and observed engagement with the scientific and artistic ideas and tools presented will be examined and analyzed. A mixed methods approach will also be employed for the formative and summative evaluations, which will be conducted by The Goldstream Group. Ultimately, the project endeavors to increase STEM learning and interest through art, build capacity through professional development, advance the research base on girls' science identity and inspire and interest girls in STEM careers.
DATE: -
TEAM MEMBERS: Laura Conner Stephen Pompea Mareca Guthrie Carrie Tzou
resource project Media and Technology
In Defense of Food (IDOF) is a media and outreach project based on Michael Pollan's best-selling book of the same title. Through the lens of food science, IDOF is designed to engage diverse audiences in learning about: (1) how science research is conducted, (2) how research findings are used in media, marketing, and public policy, and (3) how to apply food science research in everyday life. IDOF will be created by Kikim Media, an independent production company, broadcast and distributed by PBS and supported by an extensive outreach campaign and interactive website. The project's educational materials will be developed, in part, by the Teacher's College at Columbia University's Center for Food and Nutrition, with dissemination supported by the Coalition for Science After School and by Tufts University's Healthy Kids Out of School initiative, which involves nine of the leading out of school time (OST) organizations, such as Girl Scouts USA, and the National Urban League. The project advisory committee includes highly respected researchers in food, nutrition, and health. IDOF will use an integrated strategy of learning resources, combining a television documentary with online/social media, community outreach, and youth activities. Knight Williams Research Communications will conduct formative and summative evaluation of all major components of the project. The results will advance the informal science community's understanding of how the combination of a documentary with outreach, website/social media, and afterschool activities impacts motivation and learning. The evaluation study will pay special attention to the degree to which participation in the community events, social media/website, and afterschool activities motivates deeper or extended engagement with the subject. Project evaluation results and educational resources will be widely disseminated to the informal science community. IDOF includes a two-hour documentary film that will be produced in both English and Spanish; a community-level outreach campaign focused on reaching underserved audiences who may not watch public television; a set of activities for use in afterschool programs, youth programs and schools; and an interactive and content-rich website with tightly integrated social media tools. IDOF will be nationally broadcast by PBS; the Spanish-language version of IDOF will be broadcast by Vme Television. The ambitious IDOF educational materials and outreach campaign, combined with interactive web and social media, will reach large and diverse audiences. The intended impacts on audiences include increased knowledge and understanding of the scientific process by learning what food scientists do, what techniques they use, and how scientists arrive at their conclusions; the development of critical thinking skills audiences can use when evaluating messages about food and nutrition in media and advertising and when making decisions about what food to buy and eat; and becoming active learners and consumers regarding food. Evaluation results will be widely disseminated to science media producers and the informal science community via professional publications and presentations at conferences. The ultimate value of the In Defense of Food documentary and learning initiative will be to enhance public understanding of the crucial importance of science in people's everyday lives and in shaping dozens of daily decisions.
DATE: -
TEAM MEMBERS: Michael Schwarz
resource project Public Programs
Water for Life (WfL) is a full scale development youth and community based program; centered on freshwater literacy, water conservation and rainwater harvesting led by the Pacific Resources for Education Learning (PREL) in Hawaii. The goals of the project are to: (a) promote an understanding of water conservation and stewardship in areas lacking adequate quality water supplies and (b) build local capacity among rural communities to develop and employ site specific freshwater harvesting strategies proven to improve water quality. Rural communities within four Pacific Island entities in the U.S. affiliated Freely Associated States (FAS) will participate in WfL activities. PREL is collaborating with a host of organizations (such as the Federated States of Micronesia National Department of Education, Marshall Islands Conservation Society, and the Micronesian Conservation Trust, etc.) to develop and implement all phases of the initiative. This work is already improving the quality of life for hundreds of people in the FAS through water conversation education and improved water quality in local areas. Working closely with site-embedded PREL staff, Core Teams at each site - consisting of 4-6 local leaders from environmental agencies, water/sanitation systems, and education institutions - participated in a 5-day professional learning immersion in May, 2013, to buld capacities to develop and facilitate water conservation and catchment activities at the four target sites in the FAS. The Core Team members at each site now are recruiting and collaborating with local community members to implement site-specific projects that both educate and provide enhanced access to high quality drinking water. Both adults and youth are now engaging in a spectrum of proejcts that address loca needs and priorities through site-specific service learning activities. The site-specific focus in each locale, determined by the local Core Team, is distinct. In Palau, the Core Team has built broader community awareness of water conservation issues, raised the issue of water security in national conversations, engaged remote communities in improving natural rainwater drainage collection systems, and produced youth-oriented educational materials focused on local sites. In Yap, the Core Team members have collaborated with public utilities to install first-flush diverters into community rainwater catchment systems on Yap proper, and now are installing these devices in rainwater catchment systems on Yap's neighbor islands. In Chuuk, groundwater springs in remote communities are being upgraded for improved storage capacity, protection against contamination, and better public access. In Majuro (RMI), public school rainwater catchment systems are being repaired, repainted, cleaned, and upgraded so that schools can and will provide adequate drinking water to students (and to broader segments of the community during droughts). Broad segments of communities, including school classes and clubs, church and civic groups, etc. are becoming increasingly involved in building better water security and resilience for their communities, in preparation for a predicted drought, predicted to hit in the winter of 2014-2015, brought on by an El Nino event now edevelopig in the eastern Pacific. Water for Life has produced a range of locally relevant educational materials, including books, pamphlets, flyers, etc., some in English and others in local languages. Posters and billboards are being produced to enhance and maintain public awareness. Infrastructure projects are enabling better collection of more, higher quality water for drinking. A full-scale water handbook is under development, and this will serve as a basis for a self-contained water 'course' that will be offered through local community colleges. The experiences of project participants are being captured, analyzed, and reported in front-end, formative, and sumative evaluations conducted by David Heil & Associates. Thousands of individuals, comprising large segments of the participating countries' populations, will be directly impacted by the project. The results will be applicable to other remote and rural communities outside of the Pacific distressed by poor water quality and ineffective freshwater harvesting systems.
DATE: -
TEAM MEMBERS: Ethan Allen Danko Taborosi
resource project Public Programs
The Exploratorium, in collaboration with the Boys and Girls Club Columbia Park (BGC) in the Mission District of San Francisco, is implementing a two-year exploratory project designed to support informal education in science, technology, engineering, and mathematics (STEM) within underserved Latino communities. Building off of and expanding on non-STEM-related efforts in a few major U.S. cities and Europe, the Exploratorium, BGC, and residents of the District will engage in a STEM exhibit and program co-development process that will physically convert metered parking spaces in front of the Club into transformative public places called "parklets." The BGC parklet will feature interactive, bilingual science and technology exhibits, programs and events targeting audiences including youth ages 8 - 17 and intergenerational families and groups primarily in the Mission District and users of the BGC. Parklet exhibits and programs will focus on STEM content related to "Observing the Urban Environment," with a focus on community sustainability. The project explores one approach to working with and engaging the public in their everyday environment with relevant STEM learning experiences. The development and evaluation processes are being positioned as a model for possible expansion throughout the city and to other cities.
DATE: -
resource project Public Programs
The Conservation Trust of Puerto Rico is creating citizen science projects in five research areas (insect monitoring; coastal/river system management; bird communities; bat assemblages; and cultural resources) that allow 140 Hispanic residents of Puerto Rico (age 14 and older) to move along a continuum of research involvement from contributor to collaborator to co-creator. As citizen scientists engage in scientific research that measures the effects of urban development on the Manati River watershed in northern Puerto Rico, the project team is evaluating the degree to which participants show changes in science knowledge, skills, attitudes, communication, and behavior. The proposed project is accelerating the development of citizen science activities in Puerto Rico. New scientific knowledge generated by citizen scientists will have practical importance within and beyond the Manati watershed because Puerto Rico is undergoing rapid urban development, resulting in the loss of biodiversity and emergence of environmental problems such as lower water quality. Environmental data collected by citizen scientists will form an environmental database that permits long-term watershed monitoring and informs land use decision making.
DATE: -
TEAM MEMBERS: Yogani Govendry Lee Rodriguez
resource project Public Programs
Technical part.

This is a collaborative research project between Montana State University (MSU), Bozeman, USA and Gorno-Altaisk State University (GASU), Altai Republic, Russian Federation. In this NSF International Research Experiences for Students project MSU students will travel to the Altai Republic and work with faculty and students at Gorno-Altaisk University to conduct research related to native language use in learning ecological sciences in informal settings. Student researchers will conduct individual studies related to the project theme of science learning in ecological contexts. This project will help students learn how to conduct educational research related to the ecological learning experiences of indigenous youth (ages12-16) and the use and influence of native language in learning about environment. This research directly addresses the results of our prior NSF supported work that identified shared issues of indigenous people, natural resources and the decline of native language use among underserved populations in the Altai and Yellowstone systems. This project contributes significantly to our emerging understanding of science learning in informal settings. It addresses a unique conception of ecological learning in three dimensions; personal, community and cultural perspectives. Research and education objectives align with modern conceptualizations of informal science learning as proposed by the National Academies of Science (2009). The MSU-GASU collaboration provides a holistic view of science learning and will unite diverse intellectual resources and research efforts in unique ecological and social systems. Both the Yellowstone and Altai mountain systems are of global concern as part of worldwide natural and cultural resources impacted by pervasive development, recreation and tourism activities and climate change. The underlying theoretical foundation for learning proposed in this research project is the basis for effective approaches to enable isolated rural populations to contribute traditional knowledge and wisdom to contemporary issues related to world-wide ecological and cultural issues including global climate change. Aspects of sustainability practices that are embedded in the knowledge and social processes of both marginalized and dominant societies will be better understood and taken into consideration for future research and education activities. Research outcomes will contribute to more effective informal, place-based and experiential science learning to help empower communities and decision makers in meeting challenges of sustainability. Inevitably, we expect this work to extend our understanding of science learning related to critical natural and cultural resources and their management. An understanding of how, why and where learning takes place will help extend the US and international research and education agendas related to informal science learning, natural and cultural resource management and sustainability.

Non-technical part.

This is a collaborative research project between Montana State University (MSU), Bozeman, USA and Gorno-Altaisk State University (GASU), Altai Republic, Russian Federation. In this NSF International Research Experiences for Students project MSU students will travel to the Altai Republic and work with faculty and students at Gorno-Altaisk University to conduct research related to native language use in learning ecological sciences in informal settings. Student researchers will conduct individual studies related to the project theme of science learning in ecological contexts. This project we will help students learn how to conduct educational research related to the ecological learning experiences of indigenous youth (ages12-16) and the use and influence of native language in learning about environment. Three cohorts of five MSU students will travel to the Altai Republic for eight weeks in the summers of 2013, 2014 & 2015. MSU students will comprise a research team with GASU science, education and language faculty to conduct research in the city of Gorno-Altaisk, two medium size villages such as Onguday and two small villages such as Karakol. We expect to work with youth in each setting and interview a representative sample at each site. As a research team we expect to gain a better understanding of how indigenous youth use native Altai language in informal settings to learn about environment. We expect to compare sights within the study. As part of our larger research interests in ecological learning and native people, we will conduct a similar comparative study in the Yellowstone Ecosystem with Native American youth. The studies associated with this project will add to our understanding about the extent and nature of native language use to learn science in underserved populations in very sensitive and unique ecological and cultural settings.
DATE: -
TEAM MEMBERS: Michael Brody Clifford Montagne Arthur Bangert Christine Stanton Shane Doyle
resource project Public Programs
This Pathways project from the Ocean Discovery Institute (ODI) seeks to develop and pilot a program model designed to fill an identified gap in citizen science research and practice literature: how to effectively engage and better understand how to foster participation among people from under-represented groups in citizen science research. The ODI model is designed around six principles: (1) leaders who are reflective of the community, (2) science that is locally relevant, (3) guided, as opposed to self-guided, experiences, (4) direct interactions with scientists, (5) progressively increasing responsibilities for participants who express interest, and (6) removing barriers to participation, such as transportation, language, family involvement and access to technology. The project addresses environmentally degraded, crime-ridden local canyons, a locally relevant STEM-related issue, and leverages the Southern California Coastal Water Research Project's (SCCWRP) regional citizen science effort focused on identifying the sources and pathways of trash through regional watersheds. The scientific research components of the project focus on four canyons in the area, employing sampling methods developed by SCCWRP. Youth who are part of other ODI programs and who have demonstrated leadership and interest in science, work with the project team to scaffold family and youth participation in project activities taking place during afterschool and weekend time. Based on continued participation in the project, community participants can become more involved in the project, starting as "new scientists" and moving through "returning scientists" to "expert scientists" roles. The project evaluation seeks to identify the role and importance of the components of the proposed model with respect to participation, retention, and learning by participants from groups under-represented in STEM. The dissemination products of this Pathways project include a white paper describing the model and lessons learned as well as presentations to community groups and education and citizen science practitioners. Based on insights from the iterative approach to the model during this Pathways study, a subsequent full-scale development project would seek to engage citizen science projects around the nation in adapting the model to increase participation of individuals from groups underrepresented in STEM, including building out ODI's citizen science programming.
DATE: -
TEAM MEMBERS: Lindsay Goodwin Roxanne Ruzic Theresa Sinicrope Talley
resource project Public Programs
The University of Texas at El Paso will conduct a research project that implements and documents the impact of co-generative dialogues on youth learning and youth-scientist interactions as part of a STEM research program (i.e., Work with A Scientist Program). Co-generative dialogues seek to specifically assist with communication and understanding among collaborators. Over four years, 108 11th grade youth from a predominantly (90%) Hispanic high school will conduct STEM research with twelve scientists/engineers (e.g., chemist, civil engineer, geologist, biologist) and undergraduate/graduate students as part of 7 month-long after school program, including bi-weekly Saturday activities for 5 months followed by an intensive month-long, self-directed research project in the summer. Youth will be randomly assigned to experimental groups that include the co-generative dialogue treatment and control groups without the intervention. The scientists and their STEM undergraduate/graduate students will participate in both experimental and control groups, with different youth. Youth will receive high school credit to encourage participation and retention. The PI team hypothesizes that co-generative dialogues will result in improved learning, communication, and research experiences for both youth and scientists. Educational researchers will conduct co-generative dialogues, observations, interviews, and surveys using validated instruments to address the following research goals: (1) To investigate the impact of the treatment (co-generative dialogues) on youth knowledge, attitudes, perceptions of their experience, and their relationships with the scientists; (2) To investigate the impact of the treatment on scientists and graduate students; and (3) To identify critical components of the treatment that affect youth-scientist interactions. It is anticipated that, in addition to providing in-depth STEM research experiences for 108 youth from underrepresented groups at a critical time in their lives, the project will result in widely applicable understandings of how pedagogical approaches affect both youth learning and scientist experiences. The project also seeks to bridge learning environments: informal, formal, university and digital.
DATE: -
TEAM MEMBERS: Pei-Ling Hsu Elena Izquierdo