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Commercial Law

4 August 2026

Choosing the Correct Court Document: Claim, Petition, Affidavit or Submissions?

By Christopher N. Rosana

Four distinct natural textures arranged as separate routes, representing different Kenyan court documents.

The correct court document is chosen by the legal task it performs, not by which format appears most forceful. A pleading defines the material facts and remedy in an ordinary claim; a constitutional petition pleads a specific constitutional violation and the relief sought; an affidavit supplies sworn evidence; and submissions analyse the law and the record to persuade the court. Confusing these functions creates avoidable defects. An affidavit cannot repair an unpleaded cause of action, submissions cannot introduce evidence, and a petition should not be used simply to give an ordinary civil dispute constitutional language.

Begin with the remedy and procedural gateway

Ask first what order is needed and which law gives the court power to grant it. Recovery of a debt, damages for breach, specific performance, possession or a commercial declaration will usually call for an ordinary civil claim in the appropriate forum. A challenge to public action may require judicial review or another statutory process. A claim alleging infringement or threatened infringement of a constitutional right may call for a petition under Articles 22 and 23 of the Constitution, provided the constitutional basis is pleaded with sufficient precision.

The remedy also identifies the procedural gateway. Check jurisdiction, statutory tribunals, pre-action requirements, limitation, notice, exhaustion of alternative mechanisms and any specialised court. A litigant may have a legitimate grievance but still choose the wrong process. The correct question is not merely “what has happened?” but “what legal right is asserted, against whom, and what order can this court make through this procedure?”

Do this analysis before selecting a template. Templates organise information; they do not decide jurisdiction or create a cause of action. If the proposed document cannot state the remedy, legal source and essential facts in a coherent opening, the procedural choice may need reconsideration.

Use a claim or plaint to define an ordinary civil dispute

A plaint or other prescribed claim document states the case that the defendant must answer. It identifies the parties, jurisdictional facts, cause of action, material facts, relief and any particulars required by the applicable rules. Its function is notice and issue definition. It should not narrate every item of evidence or become a written address to the court.

For a contract dispute, the pleading ordinarily identifies the agreement, relevant obligation, performance or readiness to perform, breach, loss and prayers. For a tort claim, it should state the relationship or duty, acts or omissions, causation, damage and relief. The precise elements differ, but the discipline does not: plead the facts necessary for the legal result and reserve proof for the evidence stage.

A defence, counterclaim or reply has its own function within that same architecture. The party should not use affidavits or submissions to alter the material case after pleadings have fixed the issues. If the facts or remedy change materially, consider whether amendment is necessary under the applicable rules.

Use a constitutional petition for a constitutional controversy

A petition should identify the constitutional provision relied on, the acts or omissions said to violate it, the person or public body responsible, the factual basis and the remedy sought. Precision matters. Simply citing the Constitution alongside a private-law disagreement does not convert the dispute into a constitutional petition. The petition must show why the constitutional route is necessary and what constitutional question the court is being asked to resolve.

Article 22 permits a person to institute court proceedings where a right or fundamental freedom in the Bill of Rights has been denied, violated, infringed or threatened, while Article 23 addresses High Court jurisdiction to grant relief. Those provisions are powerful but do not remove applicable procedural doctrines, statutory remedies or the need for proper pleadings. Where legislation provides an effective process for the grievance, the question of exhaustion should be addressed rather than ignored.

Keep constitutional facts distinct from conclusions. State the conduct, decision, policy, omission or process complained of and connect it to the protected right. Then seek relief that follows from the pleaded violation. General assertions that rights were breached, unsupported by a factual account and a defined remedy, do not help the court or the responding party.

Use affidavits for sworn evidence, not legal argument

An affidavit is a sworn statement of facts within the deponent’s knowledge, or of information and belief where the basis is properly disclosed. It supports applications, petitions and other procedures where evidence is required in that form. Its value comes from accountability, clarity and the ability of the other side to respond or test the evidence where the procedure allows.

Use numbered paragraphs, identify the deponent’s capacity and source of knowledge, and exhibit documents carefully. An affidavit should distinguish what the deponent personally saw or did from what records show and from information received from another person. Arguments about what the law means, attacks on counsel or extended submissions should ordinarily be left for submissions. A sworn document crowded with argument can obscure the actual evidence.

An affidavit cannot supply a material cause of action that the pleading omitted. Nor should it contradict the party’s pleaded case without confronting the procedural consequence. Before commissioning, check the exhibits, dates, names, translations, annexures and authority of the deponent. A precise affidavit can be powerful; an inaccurate one can damage the entire application.

Use submissions to connect authority, record and relief

Submissions are written or oral argument. They should identify the issues arising from the pleadings and evidence, state the controlling law, apply that law to the record and ask for a precise order. They are not a second pleading and not a substitute witness statement. A submission cannot introduce a new factual case through assertion, even if the point would have been attractive had it been pleaded and proved.

Organise the analysis around the decision the court must make. Cite the primary legal source and binding authority first where available; address adverse authority candidly; and cross-reference the relevant affidavit, exhibit, testimony or admitted fact. End each issue with the consequence sought. This structure lets the court test the reasoning without searching through a mass of quotations.

Before filing any document, check the current rules, the practice directions of the relevant court and any case-management order. The Court of Appeal has emphasised that parties are bound by their pleadings. Selecting the correct document at the outset gives the court a fair, workable record on which to determine the real dispute. This is general information, not advice on a particular case.

A useful pre-filing check is to name the document’s one job in a single sentence. A plaint asks the court to determine a pleaded civil claim. A petition asks it to determine a pleaded constitutional violation. An affidavit proves identified facts on oath. Submissions explain why the law applied to the existing record produces a defined order. If the draft is trying to do all four jobs at once, separate the work into the documents and procedural steps the rules require.

This distinction also assists clients. It explains why the lawyer may need instructions, documents, a deponent and an evidence review before a strong argument can be written. Persuasive legal writing depends on the correct procedural foundation; it cannot safely be improvised after filing.

Official source: Constitution of Kenya, 2010 (Kenya Law).

Part 9 of 24 in this series.

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