How this library works

Why a library

Before you sign the next branch lease you need a rule to judge it by: sign, sign with conditions, or not yet. This library holds that rule and what surrounds it, because one idea is not enough. The Doctrine says what must be true; the volumes apply it to one decision; the tools put it on your numbers; the essays explain it with one image. The Lab asks whether it held up in the Saudi market. Method before result, and the Saudi market is where it is applied.

How I work

This library is the way I work with a group, written down. In ten sentences:

1. I start with a 30-minute review: the number of branches, the average monthly revenue per branch, and the plan for the next openings.
2. I name the constraint that will break your next stage: site, capacity, cash or channel.
3. For each candidate branch I work out payback in months: capex ÷ net monthly contribution after the sales it moves from your branches.
4. I estimate the share of sales it will take from your nearby branches, then measure it for real in months 3 and 6.
5. I count each door (dine-in, pick-up, each platform) by its contribution after commission and advertising, not by its revenue.
6. I check peak capacity: no campaign for a branch running above 80% of its capacity at peak.
7. I check cash: what the new branch costs before it gives, and whether the group can carry it if openings stopped for six months.
8. I write the verdict: sign, sign with a written lever plan, or not yet.
9. The board approves the rule in writing before it sees the next site, and I review every new branch on its ninetieth day.
10. Every number in my work has a declared type (a rule, a hypothetical example, a figure a group reported, or a fact with its source), and every error is corrected publicly, with its date.

You can try the verdict of sentence eight on your own numbers in the Branch Gate: https://seiflden.com/gate/

A code for every work

Every work has a fixed code and a version: RE-D 2.0 is the Doctrine, second edition. The first number changes when a rule or threshold changes; the second when a chapter or clarification is added. A link without a version always opens the latest.

Four statuses; two are shown

Published: you can read it today. Method first: the method and its dates are public; the result follows under a stated rule. Anything in review or planned does not appear in the Library at all.

What counts as evidence

Five kinds of figure, never mixed: default decision thresholds from the Doctrine and Playbook; labelled illustrative examples; regulatory facts with source and date; external signals, marked as signals; and evidence, meaning results reported by client groups for a stated period. A field observation is not evidence and is labelled as an observation.

Ideas belong to their authors

Much of what is here is established work by others, and they are named. What is new is the Saudi decision and the Saudi numbers.

Corrections

If you find an error, write to me. I reply within 7 days (14 in Ramadan) and publish the correction in the changelog with its date: old text, new text, reason. No published number is changed silently.

How to cite

Alhajj, S. (2026). Revenue Engineering Doctrine (RE-D 2.0). seiflden.com. https://seiflden.com/doctrine_en.html