A board effectiveness review asks the question boards find hardest to ask themselves: is this group of people actually governing well? For listed companies the exercise is codified — the 2024 Corporate Governance Code expects an annual board performance review, externally facilitated at least every three years for the FTSE 350 — but the practice has spread far beyond the Code's reach, into private companies, charities and regulated firms, because the underlying problem is universal: boards mark their own homework, and without a structured look in the mirror, dysfunction compounds politely for years.
What the frameworks actually require
The 2024 Code (Provision 21) made a deliberate language shift from board "evaluation" to "performance review" — signalling outcomes over ritual: the chair leads an annual review of the board, its committees and individual directors (the chair's own performance being reviewed by the senior independent director with the non-executives, not by the chair themselves), with external facilitation at least every three years for the FTSE 350, and the annual report describing what was done and what changed. It runs comply-or-explain, and sits alongside the harder-edged neighbour arriving in the same reporting seasons — the Provision 29 controls declaration — which is quietly raising the bar for what "we reviewed the board" needs to evidence.
Outside the listed world: large private companies reporting under the Wates Principles commit to board composition and effectiveness on an apply-and-explain basis; charity governance codes expect trustee-board reviews (external every three years for larger charities); and FCA-regulated firms find board effectiveness questions embedded in supervision — a weak board is a root cause finding in most enforcement narratives. Outside the FTSE 350 the Code sets no fixed external cycle — though it still expects reviews to be externally facilitated from time to time, and sector or supervisory requirements can impose their own. A striking number of unlisted boards now commission one anyway, because the alternative is discovering the board's weaknesses through the event that exposes them.
What a real review covers — and what a cosmetic one skips
The difference between the two is observable in the scope. A genuine review examines: composition and skills against where the strategy is going, not where it has been; information flows — whether packs inform decisions or bury them (the single most common finding, in our experience, is a board reading 300 pages to find the five that matter); dynamics — whether challenge actually happens, whether the executive dominates, whether dissent survives the chair; committee effectiveness and the seams between committees and board; and decision quality in retrospect — tracing two or three major decisions back through the papers and minutes to see how the machinery really performed. Cosmetic reviews, by contrast, circulate a satisfaction questionnaire, average the scores, and report that the board rates itself highly — which it reliably does.
Method follows stakes: internal self-assessment (questionnaire plus chair-led discussion) is legitimate for the in-between years; externally facilitated reviews add confidential one-to-one interviews, meeting observation and benchmarking — and, crucially, a channel through which directors say the things they will not say in the room. The external reviewer's real product is usually three sentences nobody internal could deliver.
Making the output matter
Reviews fail in the follow-through, not the fieldwork. The practices that separate improvement from theatre: an action plan with owners and dates, treated like any other board commitment and revisited at the next review (the first question of which should be "what happened to last year's actions"); disclosure that says something — the annual reports worth reading name the themes found and the changes made, not just the process followed; and a willingness to let reviews touch the untouchable subjects, chair succession above all, since a review that cannot discuss the chair is scoped to miss the most common problem. Boards get the reviews they commission: a tight brief, a reviewer with licence to be candid, and a chair who wants the truth produce one kind of exercise; the alternative produces a filing.
For boards outside the FTSE 350
The proportionate version for a private company, charity or regulated firm is not a £100,000 listed-company review; at its lightest it is a structured day — governance documents and packs reviewed, a sample of directors interviewed, a decision or two traced, findings and an action plan delivered to the chair. A day buys triage, not the depth of a full review with comprehensive interviews, meeting observation and evidence testing; scope should be chosen knowingly. Done every couple of years, it catches the classics early: the founder-board that never renewed, the committee structure outgrown by the business, the information pack nobody redesigned since the company was a quarter of its size. Acumon runs exactly these through our corporate governance practice, alongside internal audit where boards want the effectiveness question asked continuously rather than episodically. The Code's insight travels well beyond the Code: boards that examine themselves on purpose get better; boards that wait to be examined by events do not get to choose the timing.