D874 Three Dimensional Science and Engineering, catalog number EDUC 3267, is the three-CU first course in the science teaching methods sequence, built around integrating disciplinary core ideas, crosscutting concepts and science and engineering practices. The name describes the assessment as well as the content. A lesson that teaches content and calls an activity a practice has produced one dimension and a decoration, and rubric aspects in this course are designed to detect exactly that.
What the three dimensions actually require
Disciplinary core ideas are the content: the small number of powerful ideas a discipline is built on, chosen because they explain many phenomena rather than because they appear in a textbook. Science and engineering practices are what students do: asking questions, developing and using models, planning investigations, analysing data, using mathematics, constructing explanations, designing solutions, arguing from evidence and communicating information. Crosscutting concepts are the lenses that work in every discipline: patterns, cause and effect, scale, systems, energy and matter, structure and function, stability and change.
Integration means the three arrive together in one task. A student explains a phenomenon, using a model they built, by tracing energy through a system. Remove any dimension and the task collapses into something more familiar and less demanding: content recall, a craft activity, or a general thinking exercise with no science in it. When you write a lesson for this course, the test is whether you can name all three dimensions in the same sentence describing what students do.
The engineering half deserves separate attention because it is genuinely different from investigation. A scientific question is answered by evidence; a design problem is solved within constraints and judged against criteria. Students defining a problem, generating solutions, testing against criteria and improving a design are doing engineering, and confusing it with a science experiment is one of the commonest errors in submissions to this course.
Turning scored aspects into a lesson or unit plan
Scoring detail lives in your Course of Study rather than in the public catalog, so read it before choosing a phenomenon. The aspects usually determine how many dimensions have to be visible and whether an engineering element is required, and a phenomenon that cannot carry both wastes a week.
Each aspect is judged alone with a 2 needed in each. In a three-dimensional design that has a specific implication: the practice aspect and the crosscutting concept aspect cannot be satisfied by a strong content section, and they are the two most often left implicit.
The word budget, worked. Suppose six scored aspects and directions asking for roughly 1,900 words alongside any plan template. Reserve 130 words to describe the phenomenon and the class and 100 for a close, leaving about 1,670, or 275 an aspect. Then rebalance: the practices aspect and the crosscutting concept aspect each take an extra 70 words, drawn 35 at a time from the content sections, because content is the dimension candidates write fluently and the other two are where returns happen.
Budget separately for finding the phenomenon. An anchoring phenomenon has to be observable, puzzling and explainable with the core idea you are teaching, and locating one that satisfies all three takes longer than writing the lesson around it.
A structure that fits a three-dimensional lesson
Follow the directions' template where one is supplied. Where the arrangement is yours, this order keeps each dimension visible to an evaluator.
| Section | What belongs in it | What earns the aspect |
|---|---|---|
| Phenomenon | The observable event students will explain, and why it is puzzling | Scored for being a phenomenon rather than a topic with a question mark |
| Performance expectation | The standard, quoted with its code and its three dimensions identified | Scored for identifying all three rather than the content alone |
| Core idea | The content students need and the level appropriate to the grade | Scored for accuracy and for being genuinely core |
| Practice | What students do, named as a practice, with the product it generates | Scored for students doing it, not the teacher demonstrating it |
| Crosscutting concept | The lens applied and where in the lesson students use it explicitly | Scored for explicit use; implicit patterns do not count |
| Engineering element | The design problem with constraints and criteria, where required | Scored for constraints and criteria being real |
| Sequence and supports | Timed steps with adjustments for named learner needs | Scored for feasibility and specificity |
| Assessment | Evidence that shows all three dimensions, with criteria | Scored for assessing what was claimed to be taught |
Write the assessment first if you can. Three-dimensional assessment is the hardest part to retrofit, and a task designed at the end usually measures content alone because that is the easiest thing to score.
Evidence craft in a three-dimensional plan
The evidence here is standards, research on science learning and the phenomenon itself.
- Quote the performance expectation with its code and name the three dimensions it bundles rather than paraphrasing it.
- Cite the source of your phenomenon, whether it is a dataset, a video, a local observation or a published case.
- Name practices using the standard vocabulary rather than describing an activity, because the aspect is looking for the practice.
- Support instructional decisions with science education literature, particularly on model building and argumentation.
- Where students analyse data, use real data with a source and a date rather than invented numbers.
- Address the reading and mathematical demand of the materials for the grade you named.
- Use APA where directions require it, including for framework documents.
Watch the difference between a demonstration and a practice. A teacher building a model at the front, however good, is content delivery. Students building, testing and revising a model is the practice the standards name, and the distinction is usually what separates a passing plan from a returned one.
What separates Competent from a plan sent back
Aspects score independently, so returns usually name the dimension that was mentioned but never designed.
- All three dimensions appear in what students do, not only in the standard quoted.
- The phenomenon is observable and genuinely requires the core idea to explain.
- The practice produces a student artefact that can be examined.
- The crosscutting concept is used explicitly and named for students.
- Engineering elements state constraints and criteria.
- Assessment produces evidence for every dimension claimed.
Performance assessment work can be revised and resubmitted without a grade penalty, so a return costs calendar time inside a six-month flat-rate term. Where any part of the course is assessed by a proctored objective assessment we prepare only and never sit it, we never ask for portal credentials, and we never teach lessons, contact schools or complete field placement paperwork.
Six mistakes that cost time in D874
- Choosing a topic instead of a phenomenon. Photosynthesis is a topic; a plant kept in the dark that dies while an identical one thrives is a phenomenon.
- Naming a practice without students doing it. The dimension is defined by student activity, and a demonstration does not satisfy it.
- Leaving the crosscutting concept implicit. If students are never told they are reasoning about scale or systems, the dimension is not taught.
- Confusing engineering with experimentation. Design has constraints and criteria; investigation has a question and evidence.
- Assessing content only. A quiz at the end undoes a three-dimensional lesson in a single stroke.
- Underestimating phenomenon hunting. Finding one that is observable, puzzling and explicable takes real time and should be started first.
How support works on this course
Send the task directions and the scoring detail from your Course of Study. What comes back is a phenomenon that can carry the standard, a plan where each of the three dimensions is visible in what students do, an engineering element with real constraints where one is required, and an assessment designed to produce evidence for all three.
If you have not chosen a phenomenon, start there with us. It is the decision that determines whether the rest of the plan is straightforward or a struggle, and it takes fifteen minutes to get right.
The habit transfers to every later methods course and to the classroom itself, which is why this course is placed first in the sequence.
The other thing worth doing early is reading a performance expectation properly. They are compressed documents: a single line bundles a content idea, a practice and a crosscutting concept, and the associated material spells out what each one means at that grade. Candidates who read only the headline sentence design lessons that miss two dimensions without noticing, while candidates who read the full expectation find that the lesson design is half specified for them before they start.
Questions students ask about D874
Is D874 the same course as EDUC 3267?
How is D874 different from D885?
What makes something an anchoring phenomenon?
Three dimensions and only content on the page?
Send your task directions and standard. You get a phenomenon that carries the lesson, practices students actually perform and assessment that produces evidence for all three.
Where D874 sits in WGU's programs
The July 2026 catalog places this code in 8 current WGU programs. Open a program page for the complete standard path and term positions. The live Degree Plan remains authoritative after transfer credit, substitutions, and mentor planning.
The assessments, one by one
The public catalog does not publish this course's PA/OA identity or task count. WGU Tutors publishes at most one PA manual per course and only from a WGU-controlled public rubric. Until that source exists, PA help begins from the student's real Course of Study and OA support remains preparation only.