Working edition 0.1 — November 3, 2026. 16 chapters, approximately 13,500 narrative words and 12 reusable worksheets.
A complete working book that develops a business from a bounded customer problem through evidence, offers, cash, capacity, delivery, records and review. Two fictional cases connect the calculations and decisions to twelve practical worksheets.
Download the complete book
- Complete book — US Letter PDF (51 pages)
- Complete book — A4 PDF (50 pages)
- Complete book — editable Word (DOCX)
The book includes the full narrative, examples, worksheet appendix and source notes. Read in sequence or use its contents to return to a particular question.
Worksheet companion
This companion extracts the same 12 forms included in the book. It is a convenient way to reuse the appendix, not an additional manuscript or a different set of worksheets.
- Worksheet companion — US Letter PDF (12 pages)
- Worksheet companion — A4 PDF (12 pages)
- Worksheet companion — editable Word (DOCX)
What the book covers
- Define the customer task, alternatives and an experiment that could change the decision.
- Develop an offer and explain cost, contribution, cash timing and capacity assumptions.
- Deliver the promised result and reconcile invoices, payments and supporting records.
- Prepare handoffs and interruption plans, then decide whether to continue, change, pause or stop.
Included worksheets
- BD-01 — Find a problem worth understanding
- BD-02 — Write a model you can revise
- BD-03 — Compare alternatives fairly
- BD-04 — Find the requirements for your actual activity
- BD-05 — Keep business identity consistent
- BD-06 — Test the economics and the time
- BD-07 — Describe the offer and its limits
- BD-08 — Follow a proposal without inventing revenue
- BD-09 — Test the purchase journey before relying on it
- BD-10 — Deliver a defined result and handle changes
- BD-11 — Review cash timing and unfinished work
- BD-12 — Decide what to improve, pause or repeat
Reading and using this edition
All named people, businesses, transactions and outcomes in the examples are invented. These are educational organizing records, not legal agreements, official tax forms, invoices or professional approval. Use current official sources and actual agreements for decisions that depend on specific requirements.
The PDFs are for reading and writing by hand; they are not fillable and are untagged. Editable Word versions are supplied. Native Word and font behavior, physical printing, and assistive-technology use have not been tested. Try a sample page before printing the full book.
Keep completed records private. Use aliases and private document references, and omit passwords, recovery codes, full identification or account numbers and unnecessary personal details. Label any continuation with the worksheet code, question and date.
References and source notes
References were checked November 3, 2026 for the specific claims identified in the book. The references do not endorse this publication. Use the book’s source notes to distinguish supported factual points from its original examples and methods.
Building a Useful Business expands the earlier Build a Useful Business guide, edition 0.2. Its twelve BD form titles and prompts are retained; the book supplies the longer narrative, cases and explanations. The earlier guide remains a separate edition under its original title.
- R1 — U.S. Small Business Administration — Plan your business: market research and competitive analysis
- R2 — U.S. Small Business Administration — Plan your business: write your business plan
- R3 — U.S. Small Business Administration — Plan your business: break-even point
- R4 — U.S. Small Business Administration — Launch your business: licenses and permits
- R5 — Internal Revenue Service — Starting a business
- R6 — Federal Trade Commission — Truth in Advertising
- R7 — Internal Revenue Service — Recordkeeping
- R8 — U.S. Copyright Office — Can I Use Someone Else’s Work? Can Someone Else Use Mine?
- R9 — National Institute of Standards and Technology — Cybersecurity Basics