A scoped, written engagement for founders, operators and investment teams who need an auditable read of how a leadership decision unit actually decides — applying the same published method that produces our reports.
Scope, deliverables, timeline and fee are defined in a written engagement letter before anything is payable. The figure above is the entry point of this tier, not a fixed package price.
Case studies are published only with client consent — none are cleared for publication as of 2026-10-03.
Instead, you can request a reference call (mention it in the application context field) or read the full published method at tangoera.com/method.
Where is my data stored?
We may transfer, store and process your information outside your country, including where our service providers operate. (privacy.html:132)
Who can see it?
Trusted service providers: payment, shipping, support, analytics, marketing, professional advisers, and authorities where required by law. (privacy.html:91–99)
How long is it kept?
Only as long as needed to complete transactions, meet legal obligations, resolve disputes and enforce agreements; no fixed period is published. (privacy.html:135)
Is it sold or shared?
Not sold in the conventional sense; sharing is limited to the providers listed above. Some US jurisdictions define “sharing” broadly. (privacy.html:101)
How do I delete my data?
Birth data can be deleted anytime via the automated deletion page; other data via request to privacy@tangoera.com, with replies within 72 hours. (privacy.html:128)
What security controls apply?
Reasonable administrative, technical and physical safeguards; absolute security is not claimed. (privacy.html:138)
Named sub-processor list?
待业务确认 — privacy.html lists provider categories only, no named sub-processors. (privacy.html:92–99)
Sample engagement letter: 待业务确认（尚未定稿）— no public template exists in the current site tree.
What is fixed today: scope, deliverables, timeline and fee are defined in a written engagement letter before anything is payable. (landing/advisory/index.html:101)
High-value due diligence fails when the buyer can only evaluate the seller's self-description. So the input vector, the 7-dimension output contract, the dimensional definitions, the traceability pipeline, the engineering tolerances and the known limitations are all published, in full, at tangoera.com/method before any conversation starts.
The same document carries the audit standard we hold ourselves to: if a conclusion cannot be traced back to your inputs and our published rules within 48 hours, the corresponding fee is refunded.
| Step | What happens |
|---|---|
| 1. Application | You send the short intake below. It asks for the decision context, not for payment details. |
| 2. Fit review | We reply to confirm whether the engagement is a fit for the method. If it is not, we say so and stop there. |
| 3. Scoping | A scoping conversation fixes the decision unit, the questions in scope, the deliverables, the timeline and the fee. |
| 4. Engagement letter | Everything above is written down and signed. Payment terms are stated in that letter — never before it. |
| 5. Delivery | Work is delivered against the letter, with each conclusion traceable to its inputs and the published rules. |
| 6. Audit window | If a conclusion cannot be traced within 48 hours of a request, the corresponding fee is refunded — automatic, no argument. |
| Advisory & Due Diligence | Institutional Program | |
|---|---|---|
| Entry point | from $4,800 | from $49,800 |
| Typical subject | A single leadership decision unit, founder team, or one live decision | An institution, fund, family office, or multi-team mandate |
| Diligence material | Published method paper, audit standard | Published method paper plus a written diligence pack and, on request, an NDA before any specifics are exchanged |
| Scope | Set in a written engagement letter | Set in a written engagement letter |
Four fields are required. Nothing is payable here, and this form does not create a contract. We use the details only to assess fit and reply.
Application received. We review applications in batches and will reply to the address you gave. If you do not hear from us, nothing has been charged — there is nothing to cancel.
Is $4,800 the final price?
It is the entry point of this tier. The final fee depends on scope, and scope is agreed in writing before any payment. If the agreed scope is smaller than the entry point, the fee is smaller too.
What do I actually receive?
It depends on the scope in your engagement letter, and we will not describe a deliverable here that has not been scoped with you. What is fixed is the method: the published TangoEra specification, applied to your decision unit, with every conclusion traceable to its inputs and the published rules.
Can you sign an NDA?
Yes. We are happy to execute a mutual NDA before any specifics are exchanged. Say so in the application and we will send one first.
Do you forecast outcomes?
No. The method produces a baseline decision-architecture read and an empirical correlation baseline. It does not forecast future events, and we will not present it as if it did.
Do you have references or case studies?
Not yet, and we will not invent them. We are a new practice: read the method specification and the methodology disclosure, including the stated limitations, and judge the work on that.
Is there anything cheaper to start with?
Yes. The free 90-second check costs nothing and needs no email; the sample report shows exactly what a paid report contains. Many people should start there rather than here — this tier is for a scoped organisational engagement.
TangoEra is a self-reflection and decision-support practice, not a diagnosis or a prediction. Advisory work describes baseline decision architecture and does not forecast future events or outcomes. Nothing on this page is financial, legal, medical or investment advice.
Not ready for a scoped engagement? Start with the free check and see the method at work first.
Take the free 90-second check① What TangoEra is: a self-reflection and decision-support tool — a mirror for your decision style and a starting point for honest reflection, not a verdict.
② What it is not: medical, psychological, legal, financial, or investment advice. Not astrology, therapy, or a medical diagnosis. It does not predict the future, does not forecast outcomes, and does not guarantee specific results — please exercise independent judgment. TangoEra reports are based on statistical weak correlation. They do not provide a diagnosis or treatment. For consequential decisions, consult a qualified professional.
③ What it relies on: your assessment answers, plus your birth data used only as a deterministic seed for a statistical model built on weak correlation. Scores describe a statistical baseline decision architecture. Precision limits are recorded explicitly — see /method §5.1.1.
④ If something is off: email support@tangoera.com — a person reads every message.