Preschool Portfolio Assessment: How to Design Evidence That Shows Development
By March, a teacher has forty photographs of the same four-year-old. Blocks, paint, a sticker sheet, a drawing of her family. The folder is full. Then a curriculum director asks a simple question: what does this show about how she has changed since September?
In many settings, nobody can answer quickly. The work is all there, but it was never designed to show development. That gap is where most preschool portfolio assessment goes wrong. It is a design problem, not a teacher problem.
A full folder is not evidence
What is preschool portfolio assessment?
It is a purposeful collection of a child’s work, teacher observations and reflections, dated and gathered over time. Adults use it to see how the child is developing and to decide what to teach next. The collection matters less than the decisions it supports.
The confusion is not new. Wortham, Barbour and Desjean-Perrotta opens by noting that many educators back portfolios, yet few agree on what portfolios are or what they are for. A 2025 interview study (ERICTaylor & Francis Online) of 24 educators in Türkiye and the United States found that colleagues in the same country described similar practices, which the authors read as the pull of policy and culture. A portfolio is whatever your system decides it is for.
It is also only one part of an early years assessment framework (Blog 2.1 | Early Years Assessment Framework/<<Blog_SK_V2.1>>). It works best when it holds evidence of learning in preschool that came from ordinary play [Blog 6.1], not from staged tasks.
Early childhood portfolio design starts with purpose
Wortham and colleagues describe four types.
- An evaluative portfolio checks progress against programme goals.
- A working portfolio lets teacher and child review progress together.
- A showcase portfolio holds best work only.
- An archival portfolio gives the next teacher a year-end snapshot.
The warning worth keeping is that a showcase portfolio cannot guide teaching, because it lacks evidence of everyday performance.
So the first design decision is not the binder or the app. It is one sentence of purpose. If that sentence is “to show parents our best moments,” you have a showcase, and you will need another source of evidence for planning.
Then every entry should answer three things: what happened, what it shows, and what could come next. Mangrove’s guide for childcare settings asks almost the same questions. Wortham adds two habits: date every item, and note the context, such as whether the child worked alone or with help. Description stays separate from interpretation, so a note says what was seen before it says what it means. The “what next” answer feeds directly into planning the next learning steps [Blog 11.1].
What the research says about preschool portfolio assessment at scale
| Design decision | What the evidence says | Practical rule |
| Purpose and selection | Purpose decides the portfolio type and what goes in. Contents should show how each child differs, not identical teacher-picked items (Wortham et al., 1998; S) | Fix the categories, let the items vary |
| Judging the evidence | Clemson’s rubric for early childhood student-teaching portfolios uses three levels (Not Met, Met, Exceeds), each described in words. It is built for adults, so treat it as a design analogy only (S) | Write levels as observable behaviour [Blog 7 | How to Design Developmental Rubrics for Preschool | Linked text: “developmental rubrics”] |
| Review time and rhythm | In New York City PreK for All (17 head teachers, 10 programmes), teachers collected notes, photos and samples all year but rarely had time to review or discuss them. One director gave head teachers an hour a day for assessment work (Peters & Graves, 2021; P). Wortham et al. suggest reviewing at least three times a year (S) | Put shared review time in the timetable |
| Child voice | The New York report recommends photo elicitation, using photos already taken (P). In a six-system curriculum comparison, pedagogical documentation and child participation were strongest in Finland and Norway (Ozgunay et al., 2026; S) | Ask children to talk about a photo or choose a piece |
Collecting evidence is only half the assessment process. Teachers also need time to look back across observations, identify patterns and decide what the evidence means for the child’s next learning experience. A national US survey of public-school Pre-K teachers suggests that this review work is closely connected to the planning time teachers have available.
Source: RAND — Instructional Resources in Public School-Based Pre-K
The pattern is clearest for using assessment evidence. Among teachers with less than two hours of weekly planning time, 57% said they had enough contracted time to review and use assessment data to inform instruction. That rose to 64% among teachers with two to three hours and 72% among those with four or more hours. The finding does not prove that additional planning time causes better assessment practice, but it reinforces a practical portfolio-design principle: collecting more evidence will not solve the problem if teachers are not given protected time to interpret it and decide what comes next.
A 2023 content analysis of 19 child portfolios from a Reggio-inspired and a university preschool found four shared factors behind assessment: content, features of the chosen pieces, reflection and organisation. That is a useful list of what to standardise across classrooms. (Taylor & Francis Online)
One New York head teacher argued that a clipboard-in-hand rule stops teachers from joining the play, so she photographs first and writes later. If evidence is collected during play but never reviewed together, is it still assessment, or only storage?
Read these findings with care. The New York authors say their results reflect teachers in one city during rapid expansion and are not meant to be generalised. The six-system study analysed curriculum documents, so it shows what systems say, not what classrooms do. The US Preschool Development Grant snapshot is undated. It names Teaching Strategies GOLD, Work Sampling System and HighScope COR as the most common formative tools (ERIC). It also describes formative assessment as multiple sources of evidence gathered over time, usually collected in a portfolio. Trend lists, such as eSkilled’s 2026 roundup, name digital portfolios shared with families as a growing practice. That shows direction, not effectiveness.
Where portfolios go wrong
- Volume over meaning. Wortham warns that portfolio content should never become an end in itself. Mangrove names the perfect showcase and the endless archive as the two ways portfolios become a burden.
- Ranking. Wortham’s preschool chapter plans data collection to show each child’s growth over time, not to compare children. Mangrove adds a language test: avoid labelling children “ahead” or “behind.”
- Expecting quick change. Roe and Vukelich followed four teachers’ portfolio practice over three years in a programme that required portfolios. The Wortham handbook cites that work when it says that moving to a new assessment system is as hard as moving to a new way of teaching. Plan for years, not a term. (Taylor & Francis Online)
The test for any entry is simple:
If removing it would not change a teacher’s next decision, why is it there?
Growth evidence can be modest. Wortham’s own example is a child’s stage of block building, recorded in September and again in March. Two dated points, one clear story.
Children can help tell that story. The New York report suggests sitting with a child, showing a photo already taken, and asking, “Tell me about this picture.” For what young children can and cannot tell us, see child self-reflection [Blog 12.1].
A preschool portfolio is worth about as much as the conversations it triggers. So the practical question for leaders is: who looks at this evidence together, and when? That rhythm is the hinge of a wider assessment cycle [Blog 18.1].
Where KODEIT Pre-K fits
A portfolio depends on three things upstream. KODEIT Pre-K’s materials speak to each.
What are we collecting evidence of? Teacher Books include age-appropriate, measurable learning objectives and key vocabulary. Practice Book activities are built per unit and align with several lesson objectives.
How will we record and judge it? Teacher Books include rubrics, checklists and reflection tools. The programme overview lists 270+ formative and summative evaluations (observations, portfolio tasks, milestone tracking) and 90+ rubrics. Tracing, drawing, matching and thumbprint tasks let children show learning without text. They are natural candidates for portfolio evidence, though the materials do not present them as a portfolio feature.
What happens next? The PLAY flow moves from Activate, which includes mini-reflections in words, gestures or drawings, to Yield. Yield pairs a simple assessment with a home-connection idea.
FAQs
How many items should a preschool portfolio hold?
The sources give no number. Wortham calls weekly data in every domain unrealistic. It suggests reviewing at least three times a year and checking each domain for gaps. A few dated, annotated items beat a full drawer.
Can a portfolio replace screening or tests?
No. Wortham says portfolios are not screening tools. If a delay is suspected, refer the child for screening. US state systems treat screening, formative assessment, classroom quality and teacher-child interaction as separate parts. A portfolio serves the formative part.
Should children choose what goes in?
Where the purpose allows, yes. In a working portfolio, teacher and child both choose samples, and younger children can dictate to a teacher. For preschoolers this can also mean pointing to a photo or picking one of two pieces.
Do digital portfolios reduce workload?
Only if capture is quick and review time is protected. Mangrove says digital tools help when they are built for daily life. In New York, teachers called data entry onerous, and one could not use the app because phones were banned in her room. The bottleneck may be time, not tools.