By Thaddée Leblond · Published · Updated: June 2026
Without a requirements specification, you don't buy the right ERP: you buy the most convincing demo. This document translates your needs into requirements, lets you compare vendors objectively and secures the negotiation. It covers the context, process mapping, functional and technical requirements, constraints, weighted selection criteria, scope and budget. And far better to start from a structured template than a blank page.
Why it is the central document
Without a specification, you buy the most convincing demo. With it, you stay in control: you know what you are looking for, you compare solutions on the same criteria, and you have a reference if you disagree with the integrator. It is the tool that turns an intuition into a managed project.
What it must contain
A solid ERP specification combines several blocks: the context and objectives (why this project, what gains), the current and target process mapping, the functional requirements (what the tool must do, by domain), the technical requirements (architecture, security, hosting), the constraints (legacy systems, interfaces, data migration), the weighted selection criteria, and the scope, budget and timeline.
The right level of detail
The mistake is to aim at two extremes: too vague, the document cannot compare; too detailed, it locks in the solution and rules out relevant options. The right level expresses your needs and priorities clearly, leaving the vendor free to propose how to meet them.
Weighting the criteria
Not all needs are equal. Distinguish the essential from the desirable, and assign a weight to each criterion. This weighting makes comparing offers objective and defensible — and avoids being seduced by a spectacular but secondary feature.
Saving time with a template
Starting from a blank page is the surest way to forget an essential section. A structured template — or a requirements-specification generator that guides the process — secures completeness and speeds up writing. You focus on the content, not the structure.
Frequently asked questions
It translates your needs into precise requirements, lets you compare vendors objectively, frames the project's scope and secures the negotiation. It is the project's reference document.
The context and objectives, the process mapping, functional and technical requirements, constraints (legacy systems, interfaces, data), weighted selection criteria, the scope, the budget and the timeline.
Precise enough to compare objectively, without freezing every technical detail. The aim is to express your needs and priorities clearly, not to design the solution in the vendor's place.
By starting from a structured template rather than a blank page. A requirements-specification generator guides the process and ensures no essential section is forgotten.
Sources
- Methodology for writing an IS / ERP requirements specification