Begin of the insertion**As a** project managerEnd of the insertion Begin of the deletion This work package explores the potential challenges with the current approach and seeks to come up with logical and sensible semantics for scheduling.End of the deletion

Begin of the insertion**I want to** add scheduling constraints End of the insertion Begin of the deletion ### The ContextEnd of the deletion

Begin of the insertion**So that** I better control the scheduling in my project.End of the insertion Begin of the deletion Currently, there are three states involving scheduling:End of the deletion

Begin of the insertion**Acceptance criteria**

End of the insertion * Begin of the deletion **default (no scheduling)**
* the user can _choose_ "**manual scheduling**" today for work packages by enabling a check-box
* a work can _be_ **automatically scheduled** (without input from the user)

End of the deletion In Begin of the deletion 12.2, **by default** (no scheduling),  users can pick start/end dates freely, butEnd of the deletion the Begin of the insertiondate picker thereEnd of the insertion Begin of the deletion range might sometimes be limited by relations. For example, a work package with a preceeding relationship or a following relationship:

<figure class="image op-uc-figure" style="width:75%;"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/32100/content"></div></figure>

In 12.2, **a manually scheduled** work package simply means that all relations (follows/preceeds, children/parent)End of the deletion are Begin of the insertiontwo scheduling constraints:

1. As early as possible (default)

2. Not earlier than


End of the insertion Begin of the deletion ignored. The user can select any start and finish dates; other work packages will not affect this one:

End of the deletion <figure class="image Begin of the insertionop-uc-figure"><divEnd of the insertion Begin of the deletion op-uc-figure" style="width:75%;"><divEnd of the deletion class="op-uc-figure--content"><img class="op-uc-image" Begin of the insertionsrc="/api/v3/attachments/113671/content"></div><figcaption class="op-uc-figure--description">Default constraint type: As soon as possible</figcaption></figure>End of the insertion Begin of the deletion src="/api/v3/attachments/32102/content"></div></figure>End of the deletion

Begin of the insertion* When moving a automatically scheduledEnd of the insertion Begin of the deletion In 12.2, an **automatically scheduled**End of the deletion work Begin of the insertionpackage forward the constraint is changedEnd of the insertion Begin of the deletion packages are simply work packages whose start and end dates are derived (mostlyEnd of the deletion from Begin of the insertion`_as early as possible_` to `_not earlier than_`_._End of the insertion Begin of the deletion children).End of the deletion The Begin of the insertionconstraint dateEnd of the insertion Begin of the deletion user cannot select any dates manually without enabling manual scheduling:

<figure class="image op-uc-figure" style="width:75%;"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/32101/content"></div></figure>

Semantically, &quot;automatically scheduled&quot; (zero user agency over dates) and &quot;manually scheduled&quot; (full user agency over dates) are diamentrically opposed. The default scheduling mode, whichEnd of the deletion is Begin of the insertionsetEnd of the insertion Begin of the deletion not named, sits in between (some user agency over dates).

Even with duration and non working days, this system can continueEnd of the deletion to Begin of the deletion function;End of the deletion the Begin of the insertionnew startEnd of the insertion date Begin of the insertionof the moved work package.


End of the insertion Begin of the deletion picker will simply look a bit different:

End of the deletion <figure class="image Begin of the insertionop-uc-figure"><divEnd of the insertion Begin of the deletion op-uc-figure" style="width:75%;"><divEnd of the deletion class="op-uc-figure--content"><img class="op-uc-image" Begin of the insertionsrc="/api/v3/attachments/113673/content"></div><figcaption class="op-uc-figure--description">Constraint Type: Start no earlier than</figcaption></figure>End of the insertion Begin of the deletion src="/api/v3/attachments/32201/content"></div></figure>End of the deletion

Begin of the deletion ### The Challenge

However, in even later versions when we introduce constraint types, the current approach reaches its limit. For backwards planning, we need to be able to schedule based on constrains:

End of the deletion * Begin of the insertionThere is a date picker that allows to select the `Constraint date` for `not earlier than`.

End of the insertion Begin of the deletion As soon as possible
End of the deletion * Begin of the insertionWhen changingEnd of the insertion Begin of the deletion As late as possible

This should be possible in something similar toEnd of the deletion the Begin of the deletion automatic mode, whereEnd of the deletion the Begin of the insertion`Constraint type`End of the insertion Begin of the deletion user can&#39;t directly chose dates but has the possibilityEnd of the deletion to Begin of the insertionas soon as possibleEnd of the insertion Begin of the deletion chose constrain types soEnd of the deletion the Begin of the insertionthe `Constraint date` is deleted.

End of the insertion Begin of the deletion dates that are derived respect these constraints.

One way to organise it would be like this:

End of the deletion * Begin of the insertionThere are two new work package columns:

End of the insertion Begin of the deletion **default (no scheduling)**
End of the deletion * Begin of the insertion`Constraint type`

End of the insertion Begin of the deletion **manual scheduling**
End of the deletion * Begin of the insertion`Constraint date`End of the insertion Begin of the deletion **automatically scheduled**
* **by constraint type**

However, for this to work, the user has to _enable_ automatic scheduling by choosing a constraint type, but today, automatic scheduling is not a mode the user can manually select.

### Open Questions to Discuss

1. Is a work package scheduled based on constraints automatically or manually scheduled? Is it in between?
2. What does &quot;manual scheduling&quot; mean in this sense? Unlike previously, when it simply meant &quot;ignore relations&quot;, this now also means &quot;ignore relations and ignore constraint types&quot;.
3. Should the default state be named, and if so, can it be opposed to automatic scheduling? If so, how do we deal with the &quot;default&quot; mode?
4. And if &quot;automatic&quot; is opposed to &quot;manual&quot;, how can we make it possible to _not_ have to select a constraint type? How does one select the default mode that is neither automatic, nor manual?

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Or do we need three scheduling modes, and the constraint types are only offered when &quot;Automatic&quot; is selected?

As an example, **default scheduling does not show constraint types** and behaves like it does today (except now it is named):

<figure class="image op-uc-figure" style="width:75%;"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/32203/content"></div></figure>

But **automatic scheduling shows constraint types**, with &quot;as early as possible&quot; selected by default:

<figure class="image op-uc-figure" style="width:75%;"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/32204/content"></div></figure>End of the deletion