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Planetary Technology Standard RFCs

Changes to the standard are considered "substantial", and we ask that these be put through a bit of a design process and produce a consensus among the Planetary Technology community and the sub-teams.

The "RFC" (request for comments) process is intended to provide a consistent and controlled path for changes to the Planetary Technology Standard (PTS).

Table of Contents

When you need to follow this process

You need to follow this process if you intend to make "substantial" changes to the Planetary Technology Standard, or the RFC process itself. What constitutes a "substantial" change is evolving based on community norms and varies depending on what part of the standard you are proposing to change, but may include the following.

  • Change to the content of the text

Some changes do not require an RFC:

  • Rephrasing
  • Formatting
  • Fixes of grammatical errors

If you submit a pull request to implement a change without going through the RFC process, it may be closed with a polite request to submit an RFC first.

For more details on when an RFC is required, please see the following specific guideline:

Before creating an RFC

A hastily-proposed RFC can hurt its chances of acceptance. Low quality proposals, proposals for previously-rejected features, or those that don't fit into the near-term roadmap, may be quickly rejected, which can be demotivating for the unprepared contributor. Laying some groundwork ahead of the RFC can make the process smoother.

Although there is no single way to prepare for submitting an RFC, it is generally a good idea to pursue feedback from other comunity members beforehand, to ascertain that the RFC may be desirable: having a consistent impact on the standard requires concerted effort toward consensus-building.

The most common preparations for writing and submitting an RFC include talking the idea over on #pts-discuss, filing and discusssing ideas on the RFC issue tracker, and occasionally posting 'pre-RFCs' on the discussion forum for early review.

As a rule of thumb, receiving encouraging feedback from long-standing project members, and particularly members of the relevant sub-team is a good indication that the RFC is worth pursuing.

What the process is

In short, to get a major change added to the standard, one must first get the RFC merged into the RFC repo as a markdown file. At that point the RFC is 'active' and may be implemented with the goal of eventual inclusion into the Standard.

  • Fork the RFC repo http://github.com/planetarytechnology/rfcs
  • Copy 0000-template.md to text/0000-my-feature.md (where 'my-feature' is descriptive. don't assign an RFC number yet).
  • Fill in the RFC. Put care into the details: RFCs that do not present convincing motivation, demonstrate understanding of the impact of the design, or are disingenuous about the drawbacks or alternatives tend to be poorly-received.
  • Submit a pull request. As a pull request the RFC will receive design feedback from the larger community, and the author should be prepared to revise it in response.
  • Each pull request will be labeled with the most relevant sub-team.
  • Each sub-team triages its RFC pull requests. The sub-team will either close the pull request (for RFCs that clearly will not be accepted) or assign it a shepherd. The shepherd is a trusted member who is familiar with the RFC process, who will help to move the RFC forward, and ensure that the right people see and review it.
  • Build consensus and integrate feedback. RFCs that have broad support are much more likely to make progress than those that don't receive any comments. The shepherd assigned to your RFC should help you get feedback from community members as well.
  • The shepherd may schedule meetings with the author and/or relevant stakeholders to discuss the issues in greater detail.
  • The sub-team will discuss the RFC pull request, as much as possible in the comment thread of the pull request itself. Offline discussion will be summarized on the pull request comment thread.
  • RFCs rarely go through this process unchanged, especially as alternatives and drawbacks are shown. You can make edits, big and small, to the RFC to clarify or change the design, but make changes as new commits to the pull request, and leave a comment on the pull request explaining your changes. Specifically, do not squash or rebase commits after they are visible on the pull request.
  • Once both proponents and opponents have clarified and defended positions and the conversation has settled, the RFC will enter its final comment period (FCP). This is a final opportunity for the community to comment on the pull request and is a reminder for all members of the sub-team to be aware of the RFC.
  • The FCP lasts one week. It may be extended if consensus between sub-team members cannot be reached. At the end of the FCP, the sub-team will either accept the RFC by merging the pull request, assigning the RFC a number (corresponding to the pull request number), at which point the RFC is 'active', or reject it by closing the pull request. How exactly the sub-team decide on an RFC is up to the sub-team.

The role of the shepherd

During triage, every RFC will either be closed or assigned a shepherd from the relevant sub-team. The role of the shepherd is to move the RFC through the process. This starts with simply reading the RFC in detail and providing initial feedback. The shepherd should also solicit feedback from people who are likely to have strong opinions about the RFC. When this feedback has been incorporated and the RFC seems to be in a steady state, the shepherd and/or sub-team leader will announce an FCP. In general, the idea here is to "front-load" as much of the feedback as possible before the point where we actually reach a decision - by the end of the FCP, the decision on whether or not to accept the RFC should usually be obvious from the RFC discussion thread. On occasion, there may not be consensus but discussion has stalled. In this case, the relevant team will make a decision.

The RFC life-cycle

Once an RFC becomes active then authors of the affected repo may implement it and submit the changes as a pull request. Being 'active' is not a rubber stamp, and in particular still does not mean the changes will ultimately be merged; it does mean that in principle all the major stakeholders have agreed to the changs and are amenable to merging it.

Furthermore, the fact that a given RFC has been accepted and is 'active' implies nothing about what priority is assigned to its implementations, nor does it imply anything about whether a member has been assigned the task of implementing the changes.

In general, once accepted, RFCs should not be substantially changed. Only very minor changes should be submitted as amendments. More substantial changes should be new RFCs, with a note added to the original RFC. Exactly what counts as a "very minor change" is up to the sub-team to decide. There are some more specific guidelines in the sub-team RFC guidelines for PTS changes.

Reviewing RFC's

While the RFC pull request is up, the shepherd may schedule meetings with the author and/or relevant stakeholders to discuss the issues in greater detail, and in some cases the topic may be discussed at a sub-team meeting. In either case a summary from the meeting will be posted back to the RFC pull request.

A sub-team makes final decisions about RFCs after the benefits and drawbacks are well understood. These decisions can be made at any time, but the sub-team will regularly issue decisions. When a decision is made, the RFC pull request will either be merged or closed. In either case, if the reasoning is not clear from the discussion in thread, the sub-team will add a comment describing the rationale for the decision.

Implementing an RFC

Some accepted RFC's represent vital changes that need to be implemented right away. Other accepted RFC's can represent changes that can wait until some arbitrary member feels like doing the work. Every accepted RFC has an associated issue tracking its implementation in the relevant repository; thus that associated issue can be assigned a priority via the triage process that the team uses for all issues in the relevant repositories.

The author of an RFC is not obligated to implement it. Of course, the RFC author (like any other member) is welcome to post an implementation for review after the RFC has been accepted.

If you are interested in working on the implementation for an 'active' RFC, but cannot determine if someone else is already working on it, feel free to ask (e.g. by leaving a comment on the associated issue).

RFC Postponement

Some RFC pull requests are tagged with the 'postponed' label when they are closed (as part of the rejection process). An RFC closed with “postponed” is marked as such because we want neither to think about evaluating the proposal nor about implementing the described change until some time in the future, and we believe that we can afford to wait until then to do so. Postponed pull requests may be re-opened when the time is right. We don't have any formal process for that, you should ask members of the relevant sub-team.

Usually an RFC pull request marked as “postponed” has already passed an informal first round of evaluation, namely the round of “do we think we would ever possibly consider making this change, as outlined in the RFC pull request, or some semi-obvious variation of it.” (When the answer to the latter question is “no”, then the appropriate response is to close the RFC, not postpone it.)

Help this is all too informal!

The process is intended to be as lightweight as reasonable for the present circumstances. As usual, we are trying to let the process be driven by consensus and community norms, not impose more structure than necessary.

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