139 lines
7.6 KiB
Markdown
139 lines
7.6 KiB
Markdown
# Business Case
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## Metadata
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| Key | Value |
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| --- | --- |
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| ID | BC-001 |
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| CrossReference | |
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| Language | en |
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| Domain | it |
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## Version History
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| Date | Status | Author | Reviewer | Change | Commit |
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| --- | --- | --- | --- | --- | --- |
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| 2026-10-13 | Deprecated | Jens Tirsvad Nielsen | AI as stand-in for S01 | Initial version | [f1b3c03] |
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| 2026-10-13 | Accepted | Jens Tirsvad Nielsen | AI as stand-in for S01 | CrossReference: added [UCD-001] | [259d017] |
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---
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## Executive Summary
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Day 25 of the Udemy "100 Days of Code" bootcamp asks the participant to analyse the 2018 Central Park Squirrel Census with Pandas: count the gray, cinnamon and black squirrels by primary fur colour and export the counts to `squirrel_count.csv`. This project delivers that assignment as a small, readable, runnable Python repository with tests, source documentation, a README and a three-language wiki, so that the participant keeps a reviewed solution and other course participants and GitHub visitors can reuse it.
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## Methodological and Standards Foundation
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The artifacts follow the software quality assurance (SQA) and quality control (QC) framework mounted at `framework/` (Business Case, Stakeholder Analysis, Project Plan, milestones, tasks, code). Quality is judged against ISO/IEC 25010:2023 characteristics through the QC checklists of the framework; source code is reviewed against `qc-programming-python`.
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## Problem Statement
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The lecture shows the analysis as a sequence of notebook-style steps. A participant who wants to keep, share and compare the solution has no structured repository: no repeatable set-up, no tests, no documentation and no instructions that another participant can run.
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## Business Opportunity
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A single, well-structured example repository lets the participant practise professional project hygiene (virtual environment, tests, continuous integration, documentation) on a small assignment, and gives other participants a solution to compare against.
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## Objectives
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1. Deliver a Python program that reads the squirrel census file (comma-separated values, CSV), counts squirrels by primary fur colour (gray, cinnamon, black) and writes `squirrel_count.csv`.
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2. Cover the program with automated pytest tests that run without the full census file.
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3. Document how to create a local `.venv`, upgrade pip, run the program and run the tests, for Windows PowerShell, Linux Debian and macOS.
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4. Document the source with Doxygen comments and a `Doxyfile`.
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5. Publish the repository with a description, topics, a README and a wiki in English, Danish and Bahasa Malaysia, with screenshots.
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## Scope
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### In Scope
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- Reading the census file and counting squirrels by primary fur colour.
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- Creating a summary table and exporting it as `squirrel_count.csv`.
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- A command-line entry point, `constants.py`, `pyproject.toml`, a Python `.gitignore`, pytest tests and a continuous integration (CI) workflow.
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- Doxygen comments, a `Doxyfile` and build instructions.
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- README from the framework template, a three-language wiki and screenshots.
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- Repository description and topics on the git host.
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### Out of Scope
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- Analysis beyond the three fur colours of the assignment.
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- Charts, notebooks or a graphical interface.
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- Publishing a package to PyPI.
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- Using or importing the `.env` file in the project; it holds personal tokens for publishing only.
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## Expected Benefits
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### Tangible Benefits
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- A runnable solution with passing tests and a CI pipeline.
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- A repository other participants can clone and run from the README alone.
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- A published description, topics and wiki in three languages.
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### Intangible Benefits
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- Practice in a plan-first, reviewed workflow on a small project.
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- A reusable repository layout for later days of the bootcamp.
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## Strategic Alignment
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The project supports the participant's goal of finishing the 100 Days of Code bootcamp with portfolio-quality results, and the framework's goal of showing the SQA workflow on a real, small project.
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## Success Criteria
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| # | Criterion | Target | Measure |
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| --- | --- | --- | --- |
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| 1 | Fur colour counts are correct | Gray 2473, Cinnamon 392, Black 103 on the 2018 census file | Run the program on the census file and compare with `squirrel_count.csv` |
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| 2 | Tests pass | 100 % of pytest tests pass on Python 3.13 or later | `python -m pytest` exit code 0 and CI green |
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| 3 | Runtime dependencies | 0 third-party runtime packages | `pyproject.toml` lists no runtime dependencies |
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| 4 | Documentation present | README sections, Doxyfile and wiki pages in 3 languages | Files exist; `doxygen Doxyfile` completes without warnings |
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| 5 | Repository metadata | Description and at least 5 topics set | Read back from the git host application programming interface (API) |
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## Risks
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| Risk | Impact | Mitigation |
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| --- | --- | --- |
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| The lecture uses Pandas but the repository must have no runtime dependencies | The solution differs from the lecture code | Use the standard library `csv` module; record the decision in an architecture decision record (ADR) and keep the lecture's step names as function names |
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| The census file is large and not part of the repository | Others cannot run the program | Keep the census file under `data/` and let the program accept a path argument |
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| Tokens in `.env` leak into the repository | Credential exposure | `.env` is git-ignored, never read by the project and never printed |
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| Wiki push is not available on the host | Wiki pages are not published | Keep the pages in the repository under `docs/wiki/` and report the failure |
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| Fur colour spelling differs in the data | Wrong counts | Count exact values `Gray`, `Cinnamon`, `Black` and test with fixture rows |
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## Assumptions
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- The participant (S01) is Product Owner, developer and reviewer of every artifact.
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- The census file is the 2018 Central Park Squirrel Census file the participant downloaded.
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- The git host `git.tirsystem.com` accepts the personal tokens held in `.env`.
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- Python 3.13 or later is installed on the machines that run the project.
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- The Product Owner's language is English; the wiki is the only multilingual deliverable.
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## Constraints
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- Python 3.13 or later, virtual environment with `venv`, tests with pytest.
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- Constants live in `constants.py`; configuration lives in `pyproject.toml`.
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- Folder structure `src/`, `tests/`, `docs/`.
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- Work is tracked by one branch and pull request per milestone.
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- Tokens come from `.env` and are never tested, imported or committed.
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## Cost–Benefit Assessment
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| Costs | Benefits |
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| --- | --- |
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| About one working day of effort by S01 and the AI assistant | A reviewed, documented solution reusable by S02 and S03 |
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| Maintenance of three wiki languages | Broader reach for S02 and S03 |
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The assessment is qualitative: the project is a personal learning exercise with no revenue, so a monetary return would not be meaningful.
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## Stakeholders
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| Stakeholder ID (SA) | Interest in this project |
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| --- | --- |
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| S01 | Product Owner, developer and reviewer; wants a correct, reviewed solution |
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| S02 | Course participants; want readable, runnable code and run instructions |
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| S03 | GitHub viewers; want a clear description, topics and README with no runtime dependencies |
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## Recommendation
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Proceed — the scope is small, the risks are mitigated and the result is directly reusable by the other stakeholders.
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---
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[f1b3c03]: https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/025-squirrel/commit/f1b3c034dc3880b7884646b4a4ed28e5f98fbcd3
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[UCD-001]: ./use-case-diagram.md
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[259d017]: https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/025-squirrel/commit/259d017ad257059330eb9a8bdbf940c9d082664e
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