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Author and Publication
Author: Nellie Supports Ltd
Publication Date: 15/05/2026
Citation
Nellie Supports (2026) 'Who can complete a COP3 assessment?'. Nellie Supports. Available at: https://www.nelliesupports.com/mcaguides/who-can-complete-a-cop3-assessment (Accessed: 15 May 2026).
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Copyright © 2026 Nellie Supports Ltd. All rights reserved.
This article is made available for general information, education and professional reference. It may be downloaded, printed and shared for non-commercial purposes, provided that it is reproduced in full, is not altered in any way, and is properly cited as the work of Nellie Supports Ltd. This material must not be edited, adapted, sold, republished, incorporated into commercial products, or used for commercial training, assessment, report-writing or advisory services without prior written permission from Nellie Supports Ltd.
This article does not constitute legal advice, clinical advice or a substitute for a decision-specific professional assessment. Where legislation, government guidance, court forms or external professional materials are referred to, those materials remain subject to their own copyright, licensing and re-use terms.
Abstract
This guide explains appropriate assessors and professional competence for cop3 mental capacity assessment in England and Wales. It is written for families, solicitors, deputies, attorneys and professionals who need a clear explanation of how the Mental Capacity Act 2005 applies to a specific decision. The guide separates capacity from best interests, safeguarding concern, diagnosis, risk management and general vulnerability. It identifies the relevant information, the practical support that should be considered, the evidence that normally strengthens a report and the reasoning needed where a decision may be disputed or used in court. It also explains why an assessment should focus on whether the person can understand, retain, use or weigh the information for the decision or decisions identified in a Court of Protection application, and communicate their decision. The aim is to help readers recognise what a reliable, proportionate and legally defensible capacity opinion should contain.
Who can complete a COP3 assessment?
This guide explains appropriate assessors and professional competence in the context of COP3 Mental Capacity Assessment. It should be approached as a decision-specific legal and evidential question, not a general judgement about the person. It sits within the wider mental capacity assessment service pathway but should be analysed by reference to the exact decision: whether the person can complete a COP3 assessment. The assessment should identify the relevant information, consider practicable support and explain the link between any impairment or disturbance and the person's ability to decide.
This guide is written for families, solicitors, deputies, attorneys and professionals who need a robust explanation before relying on a capacity opinion. For service support, see COP3 Mental Capacity Assessment. For the legal framework, see the internal Mental Capacity Act 2005 guide and the external sources: Mental Capacity Act 2005, Mental Capacity Act Code of Practice, COP3 form guidance, Court of Protection forms and guidance and GOV.UK deputyship guidance.
Start with the precise decision
A defensible assessment begins by recording the decision in ordinary language. For this guide, the practical question is whether the person can make the decision or decisions identified in the Court of Protection application. That wording matters because a person may have capacity for one decision but not another, and a broad label such as finances, welfare or property can hide the true legal question. The assessor should therefore record the decision, the date or period to which it relates, the available options, the foreseeable consequences and the evidence that will be used to test understanding, retention, use or weighing and communication.
Define the relevant information before testing capacity
Relevant information is the information the person needs to understand, retain, use or weigh in order to make this particular decision. For cop3 mental capacity assessment, this will commonly include the exact order sought, the decision before the Court of Protection, the person's circumstances, practicable support, impairment evidence, functional ability and whether one or more decisions must be assessed separately. It should be tailored to the person's circumstances and should not become a test of abstract legal knowledge. Where the decision is complex, the relevant information should be agreed before assessment so that the person is not tested against a moving or unclear standard.
Record practicable steps and decision-making support
The Mental Capacity Act requires support before a person is treated as unable to make a decision. Practicable steps may include simple language, written summaries, visual material, rest breaks, a better time of day, communication aids, an interpreter or careful involvement of someone who supports communication without leading the answer. A strong report does not merely state that support was offered. It explains what support was considered, what was used, how the person responded and why any further support would not have changed the functional analysis.
Separate diagnosis, vulnerability and incapacity
Diagnosis can explain why capacity is in doubt, but it does not prove incapacity. The report should identify any impairment of, or disturbance in the functioning of, the mind or brain, then explain whether that impairment causes an inability to understand, retain, use or weigh the relevant information or communicate the decision. This causative link is often the difference between a reliable opinion and a bare conclusion. It also protects the person from being treated as incapable because of age, appearance, disability, risk or disagreement with professionals.
Evidence should be transparent and balanced
The assessor should identify the sources relied on and distinguish direct observations from information supplied by others. In this type of case, useful evidence may include COP1 and COP3 forms, the letter of instruction, care or financial records, medical records, family or professional statements and direct assessment evidence. Where evidence conflicts, the report should say so and explain the weight placed on each source. This is particularly important where relatives disagree, where solicitors require a clear audit trail or where a Court of Protection application may rely on the assessment.
Apply the functional test to the person's own reasoning
The functional test asks whether the person can understand, retain, use or weigh the relevant information and communicate a decision. In practice, the most contested element is often use or weigh, because a person may repeat information but be unable to apply it to their own circumstances. The assessor should therefore record the person's own words where possible, examine how they compare options, test appreciation of foreseeable consequences and avoid substituting professional disagreement for legal incapacity.
Identify risk without turning risk into incapacity
Risk is relevant because it may form part of the information the person needs to weigh, but risk is not a shortcut to a finding of incapacity. Common risk features in this area include generic opinions, stale information, failure to identify the decision, lack of reasoning, weak causation analysis and avoidable Court of Protection delay. The proper question is whether the person can understand and use or weigh those risks, not whether the assessor, family or professional would make the same choice. Where undue influence or coercion is suspected, the report should identify the concern and explain how it affected the assessment process.
What a strong report should contain
A strong report should include the instruction, the decision, the legal framework, the relevant information, practicable steps, records reviewed, direct assessment evidence, functional analysis, causation and conclusion. If the report may be used in proceedings or professional dispute, it should also be written so that another professional can test the reasoning. Where the assessor is acting as an expert, duties under CPR Part 35 may be relevant, particularly independence, expertise and the need to state the substance of the facts and instructions.
Key takeaway
The safest approach is disciplined and evidence-led. Define the decision, tailor the relevant information, support the person, apply the functional test, explain causation and make clear what evidence supports the conclusion. That structure helps families understand the outcome, helps professionals rely on the report and reduces the risk that a capacity opinion will be rejected as generic, unsupported or legally incomplete.
Frequently asked questions
Does a diagnosis automatically mean someone lacks capacity?
No. Diagnosis may explain why capacity is in doubt, but the assessment must still apply the decision-specific legal test and consider whether the person can understand, retain, use or weigh the relevant information and communicate the decision.
Can someone have capacity for one decision but not another?
Yes. Capacity is decision-specific and time-specific. A person may manage some decisions independently but need assessment for a more complex, higher-risk, legal, financial, welfare or court-related decision.
When is a formal cop3 mental capacity assessment report useful?
A formal report is usually useful where the decision is important, disputed, high-value, professionally scrutinised, court-related or affected by concerns about undue influence, communication, fluctuating capacity or evidential reliability.
Related mental capacity assessment pages
These internal links help readers move from the guide to the most relevant Nellie Supports service page or legal framework page.
Need a decision-specific mental capacity assessment?
Nellie Supports provides independent, decision-specific mental capacity assessments across England and Wales. For support with this topic, visit COP3 Mental Capacity Assessment or the main Mental Capacity Assessments hub.