The reqT development started in 2010 at Lund University by Prof. Björn Regnell, to provide a free tool for illustrating essential requirements engineering concepts in software engineering teaching of MSc students. Since then reqT has grown into a comprehensive requirements engineering workbench and laboratory for capturing requirements modelling ideas based on experiences from practice and results from research.

Current version

Recent releases

Recent releases are published at

  • Release 3.1.6 support for Java 17
  • Release 3.1.5 minor fixes
  • Release 3.1.4 update templates
  • Release 3.1.3 move to Scala 2.12
  • Release 3.1.2 add high dpi support
  • Release 3.1.1 add server mode
  • Release 3.1.0: bump to Scala 2.11.11
  • Release 3.0.2: update docs

Older versions

Version 3.0.1

2014-11-02: Release 3.0.1

  • Improve graph generation and export including pdf, svg, png
  • Add more graph layout managers in graph export
  • Add html export including element type coloring and css
  • Add latex export
  • Improve gui including example templates
  • Improve iterators
  • Add transform iterator
  • Several bug fixes

Version 3.0.0

2014-09-07: Release 3.0.0

  • Graphical user interface with foldable tree view and syntax-colored text editor
  • Fully recursive modelling allowing models inside models at arbitrary depth
  • New powerful Scala-embedded DSL and more comprehensive metamodel
  • Metamodel-aware auto-completion in text editor
  • Export to graphviz, html, spreadsheet and more
  • New external DSL called reqtext using indentation instead of parenthesis
  • Meta-programming-enabled metamodel customization
  • All required libs are included in a self-contained jar-file - no need to install Scala

Version 3.0.0-RC1

2014-08-01: Release Candidate 1 of version 3.0.0

  • Rebuild from scratch
  • Many new features (see notes on release 3.0.0 above)

Even older versions Visit old site

Version 2.3

2014-01-26: Constraint solving, hierarchy and variability

  • Add constraint solving by integration with JaCoP
  • Add TestCase and Code and make runnable in REPL
  • Add hierarchical model attribute and flattening of Submodel
  • Add a first prototype of variability modelling

Version 2.2

2012-11-29: Improvements based on user requests

  • Restrict on sets of entities, e.g.: m / (m / Label("aa")).sources
  • File proxy attribute External to load strings externally in toHtml, e.g.:
    Feature("x") has (Gist("g"), External("myspecstring.txt",Spec.apply))
  • Escape sequence convertion from escape chars in toScala
  • Newline \n in Attribute values is replaced with <br> in HTML-generation
  • Cancelled bad code causing long execution times for large owns-structures
  • m up Feature("x") == (m / Feature("x").up ++ (m \ Feature("x"))
  • m down Feature("x") == (m / Feature("x").down ++ (m \ Feature("x"))
  • Semantic check of owns-relations: m.hasMultiOwners, m.multiOwners
  • Semantic check of missing Specs: m.hasMissingSpecs, m.missingSpecs
  • Ordering of Status and Level: Status(DROPPED) < STATUS(ELICITED)
  • Check to run all (currently 2) available checks: m.check

Version 2.1

2012-11-12: Minor fixes + improved restrict operator

  • you can now restrict models to general strings:

    m / ""
    m /+ ""
    m /-> ""
    ls //list files in user.dir
    dir // same as ls

  • Bug-fix on printing quotes in assigns:
    Model(Class("Guest") assigns(Label("one-to-many")) to Class("Stay"))

Version 2.0

2012-10-21: Major update and refactoring

  • improved DSL with increased flexibility and applicability
  • tight integration with Scala collections
  • added document templates for flexible chapter control
  • document generation focus on web instead of Latex
  • type structure revised from scratch
  • the data model is given a graph-like strukture
  • relations are now generalized, and attributes have a "has"-edge
  • A bit more idiomatic Scala
  • ...
  • TODO Still to be backported: latex generation; but Html was more important

Version 1.4

2011-11-26: prioOrder, custom chapter order by prio
* added operation prioOrder on domains:

 >   var d = Domain(feature("1", prio -> 2),feature("2",prio -> 1))
 >   d.prioOrder
 res3: List[reqT.Ent] = List(Ent(feature,2), Ent(feature,1))
  • chapter ordered based on chapter prio:
    d += chapter("x", text -> "my text", prio -> 3)
  • will place chapter("x") after all chapters with prio less than 3 and before all chapters with prio more than 3.
  • No prio is interpreted as prio -> Int.MaxValue

Version 1.3

2011-11-26: Custom chapters, changeAll with implicit deprecation

  • added entity chapter for latex chapter generation:
    d += chapter("My Chap", text -> "some text")
    d += chapter("My Chap") has (feature("x"),feature("y"))
  • added changeAll to tranform an entity and make old key deprecated:
    d **= feature("x") -> goal("x1")
    // this will implicitly add a relation goal("x1") was feature("x")
    // and also change feature("x") to have gist -> "Deprecated."
  • improved latex generation
  • added domain operations: related, unrelated, roots, leafs, intermediates

Version 1.2

2011-11-14: Tabular export/import and bug fixes

  • no auto-creation/revision dates, delete attribute, intersect operator, tables in appendix, bugfix double text
  • export to tabSep:
    > d tabSep "test" // will save entities to test.txt as a tab separated table
  • import from tabSep:
    > importation.tabSep("infile.txt","outfile.scala","nameOfDomainVar")
    > :load outfile.scala
  • remove attribute:
    > d - creation // will remove attribute creation from all entities in d
  • overview tables moved to appendix in latex generation
  • removed automatic creation and revision dates on student requests
  • new intersect operator:
    > d1 & d2
    // gives a subdomain with all common keys and
    // Elements of d1 updated with attribute values of d2 if different
  • bugfix: removed double generation of text attributes in latex

Version 1.1

2011-11-14: Settings, precondition, undefined, attribute removal

> d += setting("noTikz") //no tikz package included and no drawings
> d += setting("latexPreamble", text -> "\\usepackage{graphics}") 
> d += setting("noContext") //no context chapter generated
> d += task("x", precondition -> "all x are true")
> d.undefined //will give Set of all undefined Ent keys in relations
> d += d.undefined //will add all undefined entities
> d - feature("x", gist) //for removing single attributes

Version 1.0

2011-11-01: First usage in teaching

  • Prototypical DSL structure in place
  • Latex generation of specification and tikz generation of context diagram
  • Illustrates requirements as entities, relations and attributes