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Invite the right people and govern exactly who can view, contribute to, or approve each log.
Prepare, make, keep better decisions, together.
Use 1D2A to make better decisions before action. Identify what needs to be decided, compare options, record assumptions, evidence, risks, debate, and commitments, and preserve the reasoning for learning and outcome monitoring.
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How many classification levels should the firm use?
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Published decisions:
Information security
How many classification levels should the firm use?
Decision log · 18 nodes
D-01
Set the classification model
Decision required
answers
O-01
Use four classification levels
Selected option
supports
E-04
Maps to customer assurance requests
Evidence
opposes
R-02
Too many labels may slow adoption
Risk
Features
Everything teams need for important decisions, in one place.
Build the rationale as a graph, control who sees it, keep it accountable, and turn good decisions into reusable practice.
Develop rationale as a graph, not a write-up.
Connect assumptions, decisions, evidence, options, risks, and arguments as interlinked nodes. The structure shows how the reasoning fits together — what was considered, what changed, and why the final choice was accepted.
Decision · which vendor to select
answers
Option · consolidate on one vendor
supports
Evidence · total cost over 3 years
opposes
Risk · single-vendor concentration
Keep an immutable history
Every change is recorded, so the trail of what was decided and when always holds up later.
Request & record approvals
Route sign-off to named approvers and lock the decision once every approval is in.
Strengthen rationale with AI
Assess the reasoning for gaps, surface overlooked risks, and expand the set of options to consider.
Organize with attributes
Tag nodes with owners, areas, status, and custom attributes to organize information and data.
Publish examples & templates
Turn strong decisions into reusable practice — shared inside your organization or publicly to any 1D2A user.
Who it's for
For teams that make impactful decisions, with care.
Use 1D2A when rationale needs to be developed and preserved, options are not straightforward, decisions are consequential, accountability is important, immutable records matter, outcomes need to be monitored, and lessons can be learned.
Management
Assign a decision-maker, route approvals, and track follow-up actions by owner and due date — without losing why the trade-off was made.
Legal
Preserve assumptions, constraints, and objections as relation-linked nodes, backed by an immutable history timeline with bounded revert.
Economics
Compare options side by side in the table view, with evidence and risk attached to the exact alternative they inform.
Engineering
Branch architecture options in the tree, link dependencies and objections through relations, and attach files to the node they support.
Boards
Give directors the full rationale behind each resolution — options weighed, risks raised, approvals recorded — so fiduciary decisions are defensible long after the meeting.
Government institutions
Document policy and procurement decisions with a transparent, immutable trail that stands up to oversight, FOI requests, and public accountability.
Philanthropy
Make grant and funding choices the reasoning is visible for — the alternatives considered, the assumptions made — and monitor outcomes against what was expected.
Research & academia
Capture methodological and review decisions with their evidence and counterarguments intact, so choices can be revisited, reproduced, and learned from.
Explore the library
Explore public decision logs before signing up
Public decision logs and reusable templates are open to browse before you sign in. See how a decision log on 1D2A captures rich information about the context and outcomes of deliberation, and just how different this is from relying on generic tools to prepare and make complex decisions.
Decision contextAgreement & approvalAudit history & revertSnapshot publication
Browse public logs →
Information classification policy review
Agreed
Decision log
24 nodes · locked
Build vs. buy: customer data platform
In review
Decision log
31 nodes · 4 / 5 agree
Architecture decision record (ADR)
Template
Reusable scaffold
engineering trade-offs
Prepare, make, keep better decisions, together.
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