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CBL Data Model

Ratings

Ratings are input as children of Demonstration records. Each Demonstration can have any number of associated ratings, each associated with exactly one Skill. Accordingly, each rating is stored within a DemonstrationSkill record.

mermaid erDiagram Demonstration ||--o{ DemonstrationSkill : contains Demonstration { int StudentID date Demonstrated string ArtifactURL } DemonstrationSkill }o..|| Skill : "rated against" DemonstrationSkill { int TargetLevel "Portfolio level rating is against" int Rating bool Override } Skill { int CompetencyID string Code string Statement }

Portfolios

A portfolio exists at the intersection of a Student, a Competency, and a Level, and is backed in database by a StudentCompetency record. A student is enrolled in a given competency at a given porfolio level by creating one of these records. They can either be created manually by school administrators, or automatically by policy upon the completion of a previous portfolio within the same competency. A StudentCompetency record may also capture a predetermined baseline performance level for purposes of calculating growth.

Progress, performance level, and growth for a give portfolio are calculated based on all the ratings within all a student’s demonstrations that target the portfolio level and a skill within the competency.

```mermaid erDiagram Student ||–o{ StudentCompetency : “enrolled in”

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StudentCompetency {
    int CompetencyID
    int Level "Portfolio level (e.g. 9-12)"
    decimal BaselineRating "(optional) Predetermined baseline rating for portfolio"
    calculated progress "Current percentage of evidence requirements completed"
    calculated demonstrationsAverage "Current performance level across counted demonstrations"
    calculated baselineAverage "The saved BaselineRating, or a current calculated baseline"
    calculated growth "Current increase in performance from the baseline"
}

Competency ||..|{ Skill : contains
Competency {

}
Skill {
    int CompetencyID
    string Code
    string Statement
}

StudentCompetency ||--o{ DemonstrationSkill : "contains"
DemonstrationSkill {
    int SkillID "Matched to StudentCompetency.CompetencyID"
    int TargetLevel "Matched to StudentCompetency.Level"
    int Rating
    bool Override
}

```

Progress and performance level

The following table shows an example set of ratings that might be available for a given StudentCompetency record, where the ER1…ER4 columns illustrate that these skills all have an evidence requirement of 4 ratings:

Skill ER1 ER2 ER3 ER4
ELA.1.1 9 11
ELA.1.2 9 11
ELA.1.3 9 11

In this simple scenario, performance level is 9 and progress is 50%.