Requirements and designone of the six knowledge areas of the core guide
  • Couverture de l'eBook Décomposition fonctionnelle — version français
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22 - Functional Decomposition

22 - Functional Decomposition

Too big to hold in your head? Break it down.

"Produce and deliver the free-from ranges." One sentence, and behind it a wall: impossible to estimate, to plan, to share out. It is the trap of the project thought of as a single block — you contemplate the complexity without ever getting a grip on it.

Functional decomposition cuts that whole into a tree of functions, mutually exclusive and collectively exhaustive, down to pieces you can cost and hand over one at a time. You follow the method step by step — from the tree to the aggregated costing, through to the costed decision on the most critical branch.

This guide does not only teach you to organise a project. It teaches you to make thinkable what looked unmanageable — and to know, at last, where to start.
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What you get

  • A PDF to read on screen or print
  • The language you pick above, delivered by e-mail within the minute
  • The volume's blank template, ready to reuse
  • Future corrections and additions, at no extra cost
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What's inside

Nine chapters, the same in every volume of the collection. You learn the structure once, then find it again in every book.

  1. Welcome to the collectionWho this book is for · how to read it · why a fictional company
  2. Edelw'ice, a company with a taste for changeStructure, culture, and the challenge of the moment
  3. The problemThe case Edelw'ice has to solve: what it costs, and what nobody dares say
  4. Understanding the methodWhat the technique does, what it does not do, and its golden rule
  5. The turning pointWhat the method changes: the situation before, the situation after
  6. The method, step by stepEvery step, in order, with what it produces
  7. What it changedThe effects that take hold, and what to remember
  8. Key takeawaysThe method in one sentence · when to use it · the steps · strengths and limits
  9. Glossary and resourcesYour blank template · the essential glossary · what comes next in the collection
The full table of contents, exactly as printed in the book. Click to enlarge

The technique, played out on a real case

Edelw'ice makes artisanal ice cream in French-speaking Switzerland. It is a fictional company, and that is deliberate: the same company runs through every volume of the collection, with its teams, its constraints and its disagreements. You meet it again from one book to the next, so you never have to relearn the setting — only the technique. Who is Edelw'ice

This volume's case

A programme too big to be costed in one block, and a project manager told to give a date. The volume breaks the function down until every branch can be estimated, then reassembles the costing.

110

jours-homme, défendables ligne par ligne

3

options de production comparées

82 %

pour celle qui l'emporte

Frequently asked questions

Do I need to know the BABOK to use it?

No. The volume is written for someone who has to run Monday's session, not to prepare for a certification. The reference guide is cited at the end of each chapter, for those who want it.

How do I receive the file?

By e-mail, within a minute of payment, in the language chosen on this page. The link stays valid: you can download it again later from the same e-mail.

Is the German edition a translation?

No. It is adapted to the Requirements Engineering framework and vocabulary actually used by German-speaking practitioners.

Can I print it, or share it with my team?

Printing for your own use is intended. To equip several people, in several languages, there is a company plan.