What we have seen is this: weak requirements do not always create a weak proposal. They create several proposals that look comparable while assuming different stores. “Build subscriptions, connect the ERP and improve conversion” is an ambition, not an ecommerce requirements document a team can estimate or test.
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Table of contents
- Keyword decision
- Separate needs from solutions
- Write journeys and rules
- Specify data and integrations
- Include quality and operations
- Make requirements quotable
- StoreBuilt point of view
Keyword decision
Primary keyword: ecommerce requirements document. Secondary intents include Shopify requirements gathering, ecommerce specification and Shopify project brief UK. Search intent is project preparation and supplier comparison. Existing StoreBuilt articles cover RFPs and briefs; this guide avoids duplication by focusing on the testable requirement layer between ambition and vendor scoring. The angle supports strategy and implementation enquiries without cannibalising commercial service hubs.
Separate needs from solutions
Write the requirement before the implementation. “The customer must understand the delivery date for the selected postcode and stock state” preserves options. “Install app X in the product template” prematurely chooses one.
Use a simple structure:
When [context], [user or system] needs [capability] so that [outcome], subject to [rule or constraint].
Then add priority, owner, evidence and acceptance. Avoid vague words such as seamless, intuitive, flexible, scalable and real time unless a measurable definition follows.
| Weak statement | Stronger requirement |
|---|---|
| Fast website | Priority product templates meet agreed performance budgets on target devices |
| Better search | Shoppers can recover from synonyms, misspellings and zero-result queries |
| Flexible CMS | Merchandisers can publish approved landing layouts without code changes |
| ERP integration | Accepted paid orders reach the ERP once, with failures visible and reconcilable |
Priorities need consequence. Use “must” only where launch, revenue, customer rights or operational continuity genuinely depends on it. A backlog where everything is critical gives suppliers no safe trade-off when time or data fails.
Write journeys and rules
Document end-to-end scenarios rather than isolated pages. A subscription requirement continues through account management, payment failure, cancellation, customer service, fulfilment and reporting. A B2B price requirement touches identity, catalogue, tax, order approval and returns.
For each priority journey include:
- user and eligibility;
- starting trigger;
- normal path;
- business rules;
- empty, invalid and unavailable states;
- permissions and approvals;
- communications;
- operational handoff;
- measurement;
- acceptance examples.
An anonymous brand specified “customers can edit orders”. The phrase hid cut-off times, warehouse locks, payment changes, discounts, stock reallocation and fraud review. Turning it into scenarios allowed the team to support safe address and line changes before allocation while routing later requests to support. The narrower requirement was more useful and more estimable.
Tables help make conditional rules visible:
| Condition | Customer action | System response | Owner if blocked |
|---|---|---|---|
| Order unallocated | Change permitted fields | Reprice, validate and audit | Ecommerce operations |
| Pick started | Self-service blocked | Explain and offer contact route | Support |
| Refund increases | Approval required | Hold change and notify | Finance/operations |
Specify data and integrations
Catalogue requirements need structure, not a desired product count. Define products, variants, bundles, markets, price lists, media, attributes, compliance fields, translations, relationships and ownership. Provide messy real samples alongside ideal examples.
For integrations state:
| Dimension | Requirement question |
|---|---|
| Authority | Which system owns each field and state? |
| Trigger | Event, schedule, request or manual action? |
| Volume | Average, peak and maximum record size? |
| Transformation | Mapping, rounding, localisation and defaults? |
| Exceptions | Invalid, duplicate, late, cancelled or partial? |
| Recovery | Retry, replay, alert and manual resolution? |
| Reconciliation | How will both sides prove agreement? |
| Security | Scopes, personal data, retention and audit? |
Migration must specify history and quality. “Migrate customers” leaves open passwords, consent, addresses, tags, orders, credit, duplicates and deletion requests. Define what moves, what archives, how identity is matched and how totals are signed off.
Explore StoreBuilt Shopify migration planning.
Include quality and operations
Non-functional requirements determine whether a correct feature remains usable. Cover accessibility, security, privacy, performance, availability, compatibility, observability, maintainability and support.
Make each constraint proportional and testable. Name priority devices and journeys for performance. State the accessibility target and test approach. Define who can view or change sensitive data. Set recovery expectations for revenue-critical integrations. Require logs that help an authorised operator solve a problem without exposing customer data.
Operational readiness also belongs in scope:
- admin permissions and roles;
- configuration ownership;
- release and rollback process;
- training and documentation;
- content and data entry responsibilities;
- launch support and warranty;
- monitoring and incident routes;
- supplier handover and exit.
Shopify capabilities evolve. Keep platform assumptions linked to current official documentation and date material decisions. For custom integration requirements, Shopify’s API versioning policy is a reminder that post-launch review is part of the product lifecycle.
Make requirements quotable
Issue the same pack to each supplier: business context, current architecture, prioritised requirements, samples, volumes, constraints, target dates, budget posture and proposal questions. Ask vendors to respond to every requirement with standard, configured, third-party, custom, excluded or unknown.
Require an assumptions and exclusions register. Compare proposals by coverage and risk, not just total price.
| Comparison area | Question |
|---|---|
| Scope | Are the same journeys and cases included? |
| Method | What is configuration, app, custom work or process change? |
| Evidence | What proves the requirement is met? |
| Dependency | What must the client or vendor provide and when? |
| Ownership | Who runs it after launch? |
| Change | How are discoveries and new requirements priced? |
Requirements are not frozen forever. Version them, record decisions and trace changes to cost and acceptance. The goal is controlled learning, not pretending uncertainty has disappeared.
Ask StoreBuilt to turn your Shopify brief into delivery-ready requirements.
StoreBuilt point of view
We believe a good requirement makes disagreement useful. It gives commercial, operational and technical teams something precise to test, challenge and approve—without mistaking a preferred app or design for the underlying customer and business need.