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Expand Up @@ -4,34 +4,34 @@ title: Process Specification
redirect_from: /sips/sip-submission.html
---

The Scala Improvement Process (sometimes called SIP process) is a process for
The Scala Improvement Process (sometimes called SIP process) is a process for
submitting changes to the Scala language. This process aims to evolve Scala
openly and collaboratively.

The SIP process covers the Scala language (syntax, type system and semantics)
The SIP process covers the Scala language (syntax, type system and semantics)
and the core of the Scala standard library. The core is anything that is
referenced from the language spec (such as primitive types or the definition
of `Seq`). The SIP process is not concerned with compiler changes that do not
of `Seq`). The SIP process is not concerned with compiler changes that do not
affect the language (including but not limited to linting warnings,
optimizations, quality of error messages).

A proposed change requires a design document, called a Scala Improvement
Proposal (SIP). The committee meets monthly to discuss, and eventually vote
upon, proposals.

The committee follows the following process when evaluating SIP documents,
The committee follows the following process when evaluating SIP documents,
from an idea to the inclusion in the language.

## Definitions

- SIP (Scala Improvement Proposal): a particular proposal for changing the Scala
language (additions, changes, and/or removals).
- Committee: a group of experienced Scala practitioners and language designers,
- Committee: a group of experienced Scala practitioners and language designers,
who evaluate changes to the Scala programming language. It consists of a
Secretary, a Chairperson, and Members.
- Chairperson: person in charge of executing the process. They organize and
- Chairperson: person in charge of executing the process. They organize and
chair the meetings of the Committee, and generally make sure the process is
followed, but do not vote on proposals. The Chairperson is an appointed
followed, but do not vote on proposals. The Chairperson is an appointed
employee of the Scala Center.
- Committee Member: member of the Committee with voting rights. The Chairperson
cannot be a Member at the same time.
Expand All @@ -53,7 +53,7 @@ from an idea to the inclusion in the language.

## Stages

From being an idea to being part of the language, a SIP goes through several
From being an idea to being part of the language, a SIP goes through several
Stages that indicate the "maturity" level of the SIP. The following table
summarizes the intent of the various stages.

Expand Down Expand Up @@ -102,49 +102,49 @@ summarizes the intent of the various stages.

### Pre-SIP Stage

To initiate a discussion, any individual opens a "Pre-SIP" post in the Scala
Contributors forum. The post should be in the
To initiate a discussion, any individual opens a "Pre-SIP" post in the Scala
Contributors forum. The post should be in the
[Scala Improvement Process](https://contributors.scala-lang.org/c/sip/13)
category, and its title should start with "Pre-SIP:". The purpose of the Pre-SIP
post is to present an idea to the Scala community: a Pre-SIP should present a
problem that needs solving (i.e., motivate the changes) and present possible
problem that needs solving (i.e., motivate the changes) and present possible
solutions with pros and cons. The community is encouraged to engage in the
discussions by voicing support, comments and concerns.

During the Pre-SIP stage, the Committee is not required to be involved.
Committee Members and the Chairperson are expected to follow Pre-SIP
During the Pre-SIP stage, the Committee is not required to be involved.
Committee Members and the Chairperson are expected to follow Pre-SIP
discussions, but not required to engage.

Once at least one month has passed and the author has built some community
support for their Pre-SIP, they can Submit a SIP for discussion by the
Once at least one month has passed and the author has built some community
support for their Pre-SIP, they can Submit a SIP for discussion by the
Committee. "Community support" is loosely defined. It involves a mix of positive
comments, likes, etc. Generally, the Chairperson or a Committee member will post
a comment on the thread suggesting to submit a SIP when they see that a Pre-SIP
comments, likes, etc. Generally, the Chairperson or a Committee member will post
a comment on the thread suggesting to submit a SIP when they see that a Pre-SIP
is ready to enter the process.

### Entry into the process (SIP Submission)

To submit a SIP, a SIP Author writes a pull request to the
[scala/improvement-proposals](https://github.com/scala/improvement-proposals)
repository, following the [tutorial]({% link _sips/sip-tutorial.md %}), and
pointing to the Pre-SIP discussion. If the proposal correctly follows the
To submit a SIP, a SIP Author writes a pull request to the
[scala/improvement-proposals](https://github.com/scala/improvement-proposals)
repository, following the [tutorial]({% link _sips/sip-tutorial.md %}), and
pointing to the Pre-SIP discussion. If the proposal correctly follows the
template, and the Pre-SIP discussion seems to show some community support,
the Chairperson will accept the SIP for review, assign a SIP number, assign
3 reviewers to the SIP among the Committee Members, and assign one of the reviewers
to be the Manager of that SIP. Since "community support" is
loosely defined, any Committee Member can also comment on the PR to accept the
SIP for review (this is meant mostly as an escape hatch to prevent the
Chairperson from unilaterally blocking a SIP from entering the process). From
SIP for review (this is meant mostly as an escape hatch to prevent the
Chairperson from unilaterally blocking a SIP from entering the process). From
that point onwards, the SIP has entered the Design Stage.

If the template has not been correctly followed, or if none of the Committee
Members nor the Chairperson think that the Pre-SIP has gathered enough support,
Members nor the Chairperson think that the Pre-SIP has gathered enough support,
the PR may be closed after 2 weeks.

### PR states and GitHub labels

As soon as a SIP PR is opened, the GitHub labels `stage:pre-sip` and
`status:submitted` are applied to it. At any given moment, a SIP PR will have as
As soon as a SIP PR is opened, the GitHub labels `stage:pre-sip` and
`status:submitted` are applied to it. At any given moment, a SIP PR will have as
labels one of the following possibilities:

| | | |
Expand All @@ -167,21 +167,21 @@ labels one of the following possibilities:
Once a SIP has entered the Design Stage, the assigned reviewers will review (as
a GitHub Review on the SIP PR) the proposal within 3 weeks. The authors may then
address the concerns by pushing additional commits and ask for a new review.
This phase is iterative, like any pull request to an implementation repository.
After each request for a new review, the reviewers have 3 weeks to do another
This phase is iterative, like any pull request to an implementation repository.
After each request for a new review, the reviewers have 3 weeks to do another
round.

When the reviewers are confident that the SIP is in good shape to be discussed
with the full Committee, the Manager sets its status to "Vote Requested" and decide on a
Vote Recommendation that they will bring to the Committee. A Vote Recommendation
When the reviewers are confident that the SIP is in good shape to be discussed
with the full Committee, the Manager sets its status to "Vote Requested" and decide on a
Vote Recommendation that they will bring to the Committee. A Vote Recommendation
is either "Recommend Accept" or "Recommend Reject". The proposal is then
scheduled on the agenda of the next Committee meeting (which happens once a
scheduled on the agenda of the next Committee meeting (which happens once a
month).

At any time, the SIP Author may voluntarily Withdraw their SIP, in which case it
exits the process. It is possible for someone else (or the same person) to
become the new SIP Author for that SIP, and therefore bring it back to the
process. If a SIP Author does not follow up on Reviewers' comments for 2 months,
become the new SIP Author for that SIP, and therefore bring it back to the
process. If a SIP Author does not follow up on Reviewers' comments for 2 months,
the SIP will automatically be considered to be Withdrawn.

### Design Stage -- Vote
Expand All @@ -194,11 +194,11 @@ the Implementation Stage. There are three possible outcomes:
- Accept for implementation: the proposal then advances to the Implementation
Stage, and therefore becomes a formal recommendation to be implemented as an
Experimental feature into the compiler.
- Reject: the proposal is rejected and the PR closed. It exits the process at
this point. The reviewers will communicate on the PR the reason(s) for the
- Reject: the proposal is rejected and the PR closed. It exits the process at
this point. The reviewers will communicate on the PR the reason(s) for the
rejection.
- Keep: the proposal remains in the Design Stage for further iterations. The
reviewers will communicate on the PR the current concerns raised by the
- Keep: the proposal remains in the Design Stage for further iterations. The
reviewers will communicate on the PR the current concerns raised by the
Committee.

In order to be accepted for implementation and advance to the next stage, a SIP
Expand All @@ -207,7 +207,7 @@ must gather strictly more than 50% of "Advance" votes among the whole Committee.
For instance, if the Committee is made of 11 members, at least 6 members have to vote "Advance" for the SIP to move to the next stage.

If there was a strict majority in favor of "Advance", the PR for the SIP is Merged at this point by its Manager.
Otherwise, a second vote between
Otherwise, a second vote between
Reject and Keep will be used. A proposal needs more than 50% "Reject" votes to
be rejected in that case. Otherwise, it is kept.

Expand All @@ -231,10 +231,10 @@ An implementation will be reviewed by the compiler team, and once the
implementation is deemed good enough, it can ship as an Experimental feature in
the next release of the compiler where it's practical to do so. At that point, the SIP Manager posts a follow-up comment on the Pre-SIP discussion to invite the community to test the feature and provide feedback.

The implementers may hit challenges that were not foreseen by the Committee.
Early users may also provide feedback based on practical experience with the
Experimental feature. This feedback can be sent back to the Committee by
implementers. This is done with a PR to the SIP repository, amending the
The implementers may hit challenges that were not foreseen by the Committee.
Early users may also provide feedback based on practical experience with the
Experimental feature. This feedback can be sent back to the Committee by
implementers. This is done with a PR to the SIP repository, amending the
previously merged SIP document or raising questions for challenges. In that
case, the SIP Author and Reviewers will work together with the implementers to
address the feedback. This is again an iterative process. Reviewers may merge
Expand All @@ -249,10 +249,10 @@ rejected, with the same rules as in the "Design Stage -- Vote" section.

### Completed Stage

Once a SIP is accepted for shipping, it will be enabled by default (as
Once a SIP is accepted for shipping, it will be enabled by default (as
non-Experimental) in the next practical Minor release of the language.

From this point onwards, the feature is stable and cannot be changed anymore.
From this point onwards, the feature is stable and cannot be changed anymore.
Any further changes would have to come as an entirely new SIP.

## The SIP Committee
Expand All @@ -261,7 +261,6 @@ The current committee members are:

- Björn Regnell ([@bjornregnell](https://github.com/bjornregnell)), Lund University
- Chris Andrews ([@chrisandrews-ms](https://github.com/chrisandrews-ms)), Morgan Stanley
- Gabriele Petronella ([@gabro](https://github.com/gabro)), buildo
- Guillaume Martres ([@smarter](https://github.com/smarter)), EPFL
- Haoyi Li ([@lihaoyi](https://github.com/lihaoyi)), Databricks
- Lukas Rytz ([@lrytz](https://github.com/lrytz)), Lightbend
Expand All @@ -280,16 +279,16 @@ The current Secretary is:

### Committee Meetings

The plenary Committee Meetings are scheduled monthly by the Chairperson. They
The plenary Committee Meetings are scheduled monthly by the Chairperson. They
have the following purposes:

- Vote to accept, keep or reject SIPs that are in a "Vote Requested" state
- Be aware of the list of SIPs that are "Under review". If a SIP stays too long
under review, Committee Members may request for it to be put to discussion
- Be aware of the list of SIPs that are "Under review". If a SIP stays too long
under review, Committee Members may request for it to be put to discussion
and/or vote in a subsequent plenary meeting, even if the Reviewers do not
think it is ready. This is meant primarily as an escape hatch, preventing
think it is ready. This is meant primarily as an escape hatch, preventing
Reviewers from blocking a SIP by infinitely stalling it.
- Make any exception to the process that they judge necessary to unblock a
- Make any exception to the process that they judge necessary to unblock a
situation.

If a Committee Member cannot attend a meeting, they are welcome to share their feedback about the proposals listed in the agenda of the meeting with the Chairperson, who will relate it during the meeting. A Committee Member cannot give their voting power to someone else. If a Committee Member misses more than 2 meetings within a year, they lose their seat.
Expand All @@ -313,28 +312,28 @@ the current state of the proposal, both its design and implementation.

### On what basis are proposals evaluated?

The Committee ultimately decides how to evaluate proposals, and on what grounds.
The Committee does not need to justify its decisions, although it is highly
The Committee ultimately decides how to evaluate proposals, and on what grounds.
The Committee does not need to justify its decisions, although it is highly
encouraged to provide reasons.

Nevertheless, here is a non-exhaustive list of things that the Reviewers and
Nevertheless, here is a non-exhaustive list of things that the Reviewers and
Committee are encouraged to take into account:

- The proposal follows the "spirit" of Scala
- The proposal is well motivated; it solves a recurring problem
- The proposal evaluates the pros and cons of its solution; the solution put
- The proposal evaluates the pros and cons of its solution; the solution put
forward is believed to be the best one
- The proposal can be implemented in a way that does not break backward binary
- The proposal can be implemented in a way that does not break backward binary
nor TASTy compatibility
- The proposal makes an effort not to break backward source compatibility
- The proposal does not change the meaning of existing programs
- The proposal can be implemented on all major platforms (JVM, JS and Native)

## Exceptions and changes

The present document tries to account for most situations that could occur in
the lifetime of SIPs. However, it does not pretend to be an ultimate solution to
all cases. At any time, the Committee can decide, by consensus, to make
The present document tries to account for most situations that could occur in
the lifetime of SIPs. However, it does not pretend to be an ultimate solution to
all cases. At any time, the Committee can decide, by consensus, to make
exceptions to the process, or to refine the process.

## How do I submit?
Expand Down

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