To some management who does not really understand software development

1, You may love the fairy tales of Scrum about “an increase in business and technical risks” (taken from Scrum Primer 2.0), but we should still have to face the sad reality of “No Silver Bullet”.

2, If you do not really trust your development team, you should try to rebuild it.

3, If you can’t build a trustworthy development team by yourself after having tried several times, you should find someone to help you to do it.

4, If you can’t find a trustworthy guy to do it at all, you can go to find a Scrum trainer and pay to him/her to comfort your feelings now.

Scrum Note-20140501

1, About Project Manager:
The traditional responsibilities of a project manager have been divided up and reassigned among the three Scrum roles, and mostly to the Development Team and the Product Owner, rather than to the Scrum Master. Practicing Scrum with the addition of a project manager indicates a fundamental misunderstanding of Scrum, and typically results in conflicting responsibilities, unclear authority, and sub-optimal results.

2,About the output of Sprint
Scrum emphasizes working product at the end of the Sprint that is really “done”; in the case of software, this means a system that is integrated, fully tested, end-user documented, and potentially shippable.

3, About Story Points
But how do you know which story is a 3 and which is a five. In order to do that each team would have to find a baseline story.
If you really have to track time then don’t use story points at all.

4, About Spike
A time boxed period used to research a concept and/or create a simple prototype. Spikes can either be planned to take place in between sprints or, for larger teams, a spike might be accepted as one of many sprint delivery objectives. Spikes are often introduced before the delivery of large or complex product backlog items in order to secure budget, expand knowledge, and/or produce a proof of concept. The duration and objective(s) of a spike will be agreed between the Product Owner and Delivery Team before the start. Unlike sprint commitments, spikes may or may not deliver tangible, shippable, valuable functionality. For example, the objective of a spike might be to successfully reach a decision on a course of action. The spike is over when the time is up, not necessarily when the objective has been delivered.

5, About Tracer Bullet
The tracer bullet is a spike with the current architecture, current technology set, current set of best practices which results in production quality code. It might just be a very narrow implementation of the functionality but is not throw away code. It is of production quality and the rest of the iterations can build on this code. The name has military origins as ammunition that makes the path of the weapon visible, allowing for corrections. Often these implementations are a ‘quick shot’ through all layers of an application, such as connecting a single form’s input field to the back-end, to prove the layers will connect as expected.

6, About Definition of Done (DoD)
The exit-criteria to determine whether a product backlog item is complete. In many cases the DoD requires that all regression tests should be successful. The definition of “done” may vary from one Scrum team to another, but must be consistent within one team.

7, About Limitations
Hybridization of Scrum is common as Scrum does not cover the whole product development lifecycle; therefore, organizations find the need to add in additional processes to create a more comprehensive implementation. For example, at the start of the project, organizations commonly add process guidance on requirements gathering and prioritization, initial high-level design, and budget and schedule forecasting. However, the Scrum framework does not explicitly allow for extension points of such a kind; consequently, achieving a more comprehensive software life cycle requires extending the framework rather than instantiating it.

- Quoted from Scrum (Software Development) on Wikipedia.

Syllogism, Contribution vs. Pollution

Proof

  • Major Premise: All unnecessary consumption of resource is a kind of pollution.
  • Minor Premise: A contribution which has no value to others is unnecessary and must consume some type of resource.
  • Conclusion: A contribution without value is a kind of pollution.

Application

So we can conduct a basic precondition to open-source something:
if it’s a long-term & independent project,
  it’s ok to release after having some code.
else if it has been utilised internally by two projects/products,
    and it has been revised twice.
  it’s ready to be published.
else
  it’s better to keep it as an internal incubating one.

variable vs. immutable

Premises with Uncertainty.

  • 0, each entity may be immutable.
  • 1, a package may be variable.
  • 2, a device could be independently variable.

Rules with Certainty.

  • 0, a programmer should not assume any entity is definitely variable.
  • 1, only package and its descendants may be locally replaced.
  • 2, an independently variable property of a device must be accessed by a function implemented in native code.

Supplements about Local-Replacing.

  • 0, “impl”, “enable” and “disable” will try to apply local-replacing for the package.
  • 1, a class can explicitly provide a Local-Replacing Method, which name should start with a “$”.
  • 2, a LRM is also an instance method.
  • 3, in a LRM, all explicitly This-Calls will try to use corresponding LRMs. – ?
  • 4, in a LRM, all explicitly Base-Calls will try to use corresponding LRMs. – ?
  • 5, in a loop, all explicitly Last-Calls will try to use corresponding LRMs. – ?
  • 6, if a LRM without a normal version of method, the runtime will generate one which works like ‘((this:clone ):$method …)’.
  • 6, if a LRM without a LRM, the runtime will try to call its normal version.

closure - computer science vs. mathematics

0,closure in computer science.
In computer science, a closure (also lexical closure or function closure) is a function or reference to a function together with a referencing environment. – Wikipedia

1,closure in mathematics.
A set has closure under an operation if performance of that operation on members of the set always produces a member of the same set. – Wikipedia

2, the core functions of foolang should make up a closure in meaning of mathematics.
2.0, option-1: to keep the existing relatively complex structure.
2.0, option-2: to reduce it to a simple model.- like lisp?