135 lines
4.5 KiB
Markdown
135 lines
4.5 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 | [SA-001] |
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## Version History
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| Date | Status | Author | Reviewer | Change | Commit |
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| --- | --- | --- | --- | --- | --- |
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| 2026-10-05 | Accepted | Jens Tirsvad Nielsen | S01 | Initial version | [c0c3940] |
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---
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## Executive Summary
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Build a console coffee machine in Python as the Day 15 assignment of Udemy's
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"100 Days of Code: The Complete Python Pro Bootcamp". The program serves
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espresso, latte and cappuccino, accepts US coins, tracks water, milk and coffee
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and prints a report on request. It is published as a readable, runnable
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reference for other course participants and as a portfolio piece.
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## Methodological and Standards Foundation
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Planning follows the SQA/QC framework mounted at `framework/` (plan first, then
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code). Quality is described with ISO/IEC 25010:2023 characteristics. Code uses
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the `coding-conventions` skill and Doxygen comments.
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## Problem Statement
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The assignment specification is long and detail-heavy (resources, coins,
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refunds, change). Solutions shared by participants vary widely in structure and
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readability, and a single `main.py` script is hard to test.
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## Business Opportunity
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A small, well-structured and tested solution is a clear example for other
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participants and for viewers browsing the repository.
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## Objectives
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1. Implement the full assignment behaviour: `report`, `off`, drink selection, resource check, coin processing, change, profit.
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2. Keep the assignment's function names so participants can compare solutions.
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3. Cover the behaviour with automated pytest tests.
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4. Document how to set up a local `.venv` and run the program and tests.
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5. Publish the repository with a description, topics and README.
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## Scope
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### In Scope
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- Console program under `src/` with a `constants.py` for menu, coins and starting resources.
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- pytest tests under `tests/`.
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- `pyproject.toml`, Python `.gitignore`, `Doxyfile`, `README.md`.
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- Project documents under `docs/`.
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- Repository description and topics on the git host.
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### Out of Scope
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- Graphical or web interface.
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- Payment other than the four US coins.
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- Persistence of resources or profit between runs.
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- Runtime dependencies.
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## Expected Benefits
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### Tangible Benefits
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- Completed Day 15 assignment.
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- Runnable code with tests and setup instructions.
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### Intangible Benefits
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- Practice with planning, testing and Python project layout.
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- A reusable template for later course projects.
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## Strategic Alignment
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Supports the learner's goal of finishing the 100 Days of Code course with
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professional project hygiene, and the goal of sharing readable solutions.
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## Success Criteria
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| # | Criterion | Target | Measure |
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| --- | --- | --- | --- |
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| 1 | Assignment behaviours implemented | 100% of listed behaviours | Manual run against the specification |
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| 2 | Tests pass | All pytest tests green | `python -m pytest` |
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| 3 | Runtime dependencies | 0 | `pyproject.toml` `dependencies` is empty |
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| 4 | Setup documented | A new reader can run program and tests from README | README walkthrough |
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| 5 | Repository metadata | Description and at least 3 topics set | Repository page |
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## Risks
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| Risk | Impact | Mitigation |
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| --- | --- | --- |
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| Floating-point rounding in coin totals | Wrong change or refund | Compute money in cents (integers) internally |
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| Token in `.env` leaks | Account compromise | `.env` is gitignored, never imported or tested by the project |
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| Scope creep beyond the assignment | Delay | Out of Scope list above |
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## Assumptions
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- Python 3.13 or newer is installed.
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- The git host repository already exists and is reachable.
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## Constraints
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- Python greater than 3.13 as requested, `venv` for environments, pytest for tests.
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- Constants live in `constants.py`.
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- Source files use Doxygen comments.
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- Nothing is committed or pushed unless the user asks.
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## Cost–Benefit Assessment
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| Costs | Benefits |
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| --- | --- |
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| A few hours of the learner's time | Finished, tested, shareable assignment (qualitative; no money involved) |
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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 | Completes the assignment and owns the plan, code and review |
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| S02 | Reads and runs the code, compares solutions |
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| S03 | Browses the repository for ideas |
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## Recommendation
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Proceed — the scope is small, well specified and delivers a reusable example.
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---
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[SA-001]: ./stakeholder-analysis.md
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[c0c3940]: https://git.tirsystem.com/Tirsvad-Udemy-100_days_of_code/015-coffee_machine/commit/c0c3940551db0d7d96492cc734976d0436051ff9
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