Tag Archives: T-GEM

TPCK and Learner Activity – A Synthesis of Four Foundational TELEs

Following is a collection of visual syntheses comparing and contrasting T-GEM/Chemland with the following technology-enhanced learning environments: Learning for Use (LfU)/My World, Scaffolded Knowledge Integration (SKI)/WISE, and Anchored Instruction/Jasper. The visual syntheses contain a focus on TPCK and learner activity with the guiding TELE being T-GEM/Chemland, and all other TELEs being compared and contrasted through alignment with the T-GEM/Chemland framework.

Each one of these TELEs is developed on inquiry instruction and learning, with T-GEM/Chemland consisting of specifically model-based inquiry. Each one of these TELEs promotes a community of inquiry with purposeful teacher-student and student-student interactions. To emphasize the non-linear processes of inquiry, each visual synthesis is designed in a circular format.

Unique to T-GEM is the cyclical progress that the learner takes moving through the steps of the learning theory. Arrows are placed in each TELE’s visual representation to elicit the learner’s movement in comparison to the T-GEM’s model.

As a general mathematics and science teacher for elementary grade levels, the process of exploring, analyzing and synthesizing  the four foundational TELEs presented in this course has been transformational in my development of TPCK. Initially, the importance of CK (Schulman, 1986), and my self-diagnosed lack of CK, was convicting as I tend towards growing in pedagogical ideas and creative ways of implementing them. To further this conviction, my understanding of inquiry processes and the intricate role that the teacher facilitates in conducting a community of inquiry began to become clearer throughout the readings and discussions of Module B. Skillful inquiry instruction requires a facilitator who is saturated in CK, being equipped to prepare, respond, question, prompt, and guide with carefully considered PK. At this time, I am challenged as an educator to begin with one brave adventure in mathematics using an anchored instructional approach, and another brave lesson in physical science using a T-GEM approach. I am certain that I will be generating, evaluating and modifying all along the way.  


Cognition and Technology Group at Vanderbilt (1992). The jasper experiment: An exploration of issues in learning and instructional design. Educational Technology Research and Development, (40), 1, pp.65-80

Edelson, D.C. (2001). Learning-for-use: A framework for the design of technology-supported inquiry activities. Journal of Research in Science Teaching,38(3), 355-385.

Khan, S. (2007). Model-based inquiries in chemistry. Science Education, 91(6), 877-905.

Linn, M. C., Clark, D. and Slotta, J. D. (2003), WISE design for knowledge integration . Sci. Ed., 87: 517–538. doi:10.1002/sce.10086

Shulman, L.S. (1986). Those who understand: Knowledge growth in teaching. Educational Researcher, 15(2), 4 -14.

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Staying Afloat – Sink and Float Density T-GEM

When considering a challenging science concept, I recalled struggling with explaining the concept of floatation, or “sink or float”, when teaching kindergarten. Although exploring objects that sink and float in water is highly intriguing for young students, the reasoning behind which objects sink and float can get complicated and too abstract for a student at that age to fully understand. Why does a tiny popcorn kernel sink and a large watermelon float?

In the BC’s New Science Curriculum, density is not specifically addressed until grade six when students investigate heterogenous mixtures. In Suat Unal’s (2008) research, he recognizes that elementary students possess significant misconceptions relating to floatation as evidenced through other research by Biddulph and Osborne (1984) and Gürdal and Macaroglu (1997). This other research finds that “students offered many unrelated factors such as mass and weight” to explain floatation activity, and that even after sink and float investigations and learning of Archimedes had been completed, students “were unable to construct scientific understanding” about sink and float relations (p.135).

In preparing a T-GEM lesson, I wanted to include student investigation of objects that sink and float in water, as well as in other liquids, to help student understanding of the concept of density. Because of this specification, the Gizmos simulation that is included in the following lesson is ideal, whereas other simulations that I found online provide investigation solely with water. An image of the simulation follows:

T-GEM Lesson – Density – Grade 6 (BC Curriculum)

Teaching Strategies Student Activity
Read Aloud – Chapter 5, “Archimedes and King Hiero’s Crown” from Archimedes and the Door of Science by Jeanne Bendick. Class discussion narrating ideas presented through reading; teacher comments neutrally

GEM – Cycle 1

G – Generate Instruct students to investigate selected object in a sink and float investigation using water in a container. Students are to record observations on a T-chart as well as represent observations on a paper chart template using cut and paste images of the selected objects. Ask students to make a prediction about the types of objects that sink vs. float. With a partner, students test sink and float tendencies of selected objects in water and record on a T-chart; Students place cut out pictures of objects onto chart template; After recording data, student journal predictions about the types of objects that sink vs. float.
E – Evaluate Ask students to record anything that does not make sense about their observations and prediction – questions they may have or confusing patterns; Ask students to think of a way to conduct a sink and float investigation that could help clarify some of the observations and predictions that do not make sense. Prompt students with a change in variable – either the solid objects or the liquid. Teacher guides student through extension investigations using an alternate liquid. Students discuss with partner and record observations and predictions that don’t makes sense; Share questions and confusing patterns with class and plan a new investigation with changing one variable. Watch teacher directed demonstration and participate in class discussion.
M- Modify Ask students to determine what changes they need to add to their T-chart and paper pictorial chart to accommodate the new information accessed from the teacher-led investigation Student makes adjustments to representations of t-chart and paper pictorial chart by including results with  variable change.

T-GEM – Cycle 2

G- Generate Direct students to Gizmos online simulations: https://www.explorelearning.com {Teacher needs to previously set up an account and select simulation to add to their “class”.}

Lead students to the the elementary level lesson under Physics called “Density” Provide a short explanation of the activity, sharing that instructions are provided in text within the simulation. Remind students to record on a new chart the weight (g) of the object when measured on the scale, the volume displacement (mL)of the object within the graduated cylinder, and the the ability of the object to sink and float in each of the available liquids (water, oil, gasoline, sea water and corn syrup). After all objects have been tested, journal a relation statement based on the acquired data.   

In partners, students use the Density simulation measuring weight and volume displacement of the following objects: ping pong ball, golf ball, toy soldier, apple, chess piece, penny, egg, rock, gold nugget, crown 1 and crown 2. Students will test the floatation of each object in five different liquids and record their observations. Students will analyze their data and make a relation statement in their journal.
E-Evaluate Teacher provides students with the equation for density:

Density = Mass/Volume
And the density measurements for the 5 liquids within the simulation:

Water = 1.00 g/mL

Oil = 0.92 g/mL

Gasoline = 0.70 g/mL

Sea Water = 1.03 g/mL

Syrup = 1.33 g/mL
Ask student to evaluate their relation statement using this new information

Students compare the density of the measured objects using the density equation and with the density of the liquids and evaluate their relation statement making changes as necessary.
M-Modify Ask students to design a pictorial representation (model) of the data. Students can choose to represent objects that sink, or float, or both. The model should include density measurements of both the liquids and objects. The model should include a comparison of two or more liquids. Recommend using a chart or graph format with pictorial representations of objects. Students choose data to include in their model representation following criteria provided by teacher.

Bendick, J., (1995). Archimedes and the door of science. Bathgate ND: Bethlehem Books.
BC’s New Curriculum, (n.d.). Science 6. Retrieved from https://curriculum.gov.bc.ca/curriculum/science/6
ExploreLearning, (2017). Gizmos. Retrieved from https://www.explorelearning.com
Khan, S. (2007). Model-based inquiries in chemistry. Science Education, 91(6), 877-905. Doi 10.1002/sce.2022
Unal, S.,(2008). Changing students misconceptions of floating and sinking using hands-on activities. Journal of Baltic Science Education, 7(3), 134-146. Retrieved from http://oaji.net/articles/2014/987-1404719938.pdf

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