The Agile Lifecycle: From Planning to Delivery, Explained

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The Agile Lifecycle: From Planning to Delivery

Software Engineering · Chapter 5: Agile Methodology in PracticeSection 5.2 · lesson 32 of 1036 min · free with a free account

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In this lesson

5 phases - 2 that set direction, and 3 that repeat every cycle.

  • Relate the agile lifecycle to the sequential lifecycle
  • Describe envisioning and planning, and why both stay light
  • Explain the repeating iterate, release, and retrospective loop
  • Explain why the retrospective is what makes iteration learn

Transcript

Everything said in the video, section by section (888 words). Read along, or search it.

Agile Methodology in Practice

The Agile Lifecycle: From Planning to Delivery

The mindset behind agile thinking has to actually run on something. A concrete shape that a project follows, from its first day to its last. This section walks through that shape. The agile lifecycle, with its five recognizable phases.

From Mindset to Shape

Agile Has to Run on Something

A mindset alone does not tell a team what to do on Monday morning. The agile lifecycle gives the work a concrete shape, with five recognizable phases. Two of them, envisioning the project and producing an initial plan, happen once, near the start. The other three, iterating and building, releasing, and reflecting in a retrospective, repeat again and again, for as long as the project continues.

Repeating, Not Just Sequencing

The Same Idea, Compressed

Compare this with the strictly sequential lifecycle from earlier. That lifecycle moves through requirements, design, construction, and verification once, each completed in turn. The agile lifecycle keeps a version of the same basic idea. Plan a bit, build a bit, check the result, and learn from it. But it compresses that idea into a short cycle, and repeats the cycle many times over the life of the project. So the difference is not the steps themselves. It is the scale of each pass, and how many passes there are.

Figure 1

Set Direction Once, Then Loop

Here is the whole lifecycle in one picture. Envision and plan come first. They set the project's direction once, although both get revisited as the team learns more. Then the inner loop begins. Iterate and build, then release, then a retrospective. And then the loop starts again, with the next slice of the plan. That inner loop is the engine. It keeps running for as long as the project does.

Before the First Cycle

Envision and Plan

Envisioning a project means establishing its overall purpose, a rough sense of scope, who is involved, and what success would roughly look like. This is deliberately lighter than a full requirements document. The gaps are left open on purpose, to be filled in as the building reveals what is needed. Planning turns that vision into an actionable starting point. A prioritized list of what will be tackled, roughly in what order. That ordered list is often called the backlog. Unlike a rigid project plan meant to be protected, it stays easy to reorder, as each cycle produces something real and the team learns more.

Iterate and Build

Where Most of the Work Happens

Iterate and build is the phase that repeats, and it is where the bulk of a project's effort lives. Each cycle takes a slice of the plan, not everything at once, and turns it into something real and checkable by the end of the cycle. That is very different from developing every part of the system in parallel, toward one distant finish line. Because each cycle produces something concrete, the team gets a genuine check on its assumptions far more often. Named frameworks add their own events to structure this phase, and those come later. The generic shape is a fixed period of focused work, repeated.

Closing a Cycle

Release and Retrospective

Two more phases close each cycle. Releasing means making the cycle's work genuinely available for real use, instead of holding everything back for one large release at the end. Even a small release tells the team something a plan never could, and it delivers value sooner. A retrospective then closes the cycle. The team deliberately pauses to ask what worked, what did not, and what should change before the next cycle. Notice that a retrospective looks inward, at the team's own process. It is not an evaluation of the product that was built.

Table 1

The 5 Phases at a Glance

Here are the five phases at a glance. Envision happens once, at the outset, to establish purpose, rough scope, and what success looks like. Plan happens once and is then revisited, turning the vision into an ordered starting point. Iterate and build happens every cycle, turning a slice of the plan into something checkable. Release happens every cycle, or every few cycles, making finished work available for real use. And the retrospective happens every cycle, to reflect on the process and decide what to change.

Why This Matters

Iterating, or Repeating Mistakes Faster?

Why does the retrospective deserve so much attention? Because it separates a team that is genuinely iterating, from a team that is simply repeating the same mistakes faster. Without it, the cycle still repeats. It just stops learning anything from doing so. It helps to see how the pieces fit. Agile thinking is the attitude. The repeating loop of building, releasing, and reflecting is the concrete mechanism that puts that attitude into practice.

Key Terms

The Vocabulary of This Section

Let's lock in the key terms. The agile lifecycle is the generic five-phase shape an agile project follows. Envision, plan, iterate and build, release, and retrospective, with the last three repeating. A backlog is a prioritized, ordered list of work, produced during planning and kept easy to reorder. A release makes the work completed during a cycle genuinely available for real use. And a retrospective is a deliberate pause at the end of a cycle, to reflect on the team's process and decide what to change.

Key Takeaways

What to Carry Forward

To pull this together. The agile lifecycle compresses planning, building, checking, and learning into a short cycle, and repeats it. Envisioning and planning set direction once, and are revisited as the team learns. Iterating and building turns one slice of the plan into something real, every cycle. Releases put work into real use early, and retrospectives improve the team's own process. And without retrospectives, a team is not really iterating. It is just repeating its mistakes faster.

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Software Engineering carries a NCCRS credit recommendation. These universities work with NCCRS; some are UPI Study's signed partners. ACE and NCCRS have over 2,100 cooperating colleges that will consider accepting credits; the final decision is with the universities.

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FAQ

Questions students ask us

About The Agile Lifecycle: From Planning to Delivery

What are the phases of the agile lifecycle?
The generic agile lifecycle has five phases: envision, plan, iterate and build, release, and retrospective. Envisioning and planning happen near the start to set direction, though both are revisited as the team learns. The last three phases form a loop that repeats every cycle for as long as the project continues, with each pass building a new slice of the plan.
How is the agile lifecycle different from the waterfall lifecycle?
Both involve planning, building, and checking, but the scale and number of passes differ. A strictly sequential lifecycle moves through requirements, design, construction, and verification once. The agile lifecycle compresses plan a bit, build a bit, check, and learn into a short cycle and repeats it many times, so assumptions are checked against something real far more often.
What happens in the envisioning phase of an agile project?
Envisioning establishes a project's overall purpose, a rough sense of its scope, who is involved, and roughly what success would look like. It is deliberately lighter than a full requirements document, leaving gaps open on purpose to be filled in as building reveals what is needed. It happens once near the start, then planning turns that vision into an ordered starting point, and both are revisited as the team learns.
Why are retrospectives important in agile?
A retrospective is a deliberate pause at the end of a cycle where the team asks what worked, what did not, and what should change. It looks inward at the team's process, not at the product built. Retrospectives separate a team that is genuinely iterating from one that is simply repeating the same mistakes faster, because without them the cycle stops learning.

About the Software Engineering course

How many college credits is Software Engineering?
Software Engineering (Computer Science 301) carries a NCCRS credit recommendation for 3 semester credits. ACE and NCCRS have over 2,100 cooperating colleges that will consider accepting credits; the final decision is with the universities.
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Quizzes and assignments are online in the course. The final exam is taken online with proctoring; a person on the UPI Study team checks assignments, usually within two days.
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