The first implementation of Hope used [[strict evaluation]], but there have since been [[lazy evaluation]] versions and strict versions with lazy constructors. Roger Bailey's Hope tutorial in the August 1985 issue of ''[[Byte (magazine)|Byte]]'' references an [[Interpreter (computing)|interpreter]] for [[IBM PC DOS]] 2.0.<ref name=byte/> [[BT Group|British Telecom]] embarked on a project with [[Imperial College London]] to implement a strict version of hopeHope. The first release was coded by Thanos Vassilakis in 1986. Further releases were coded by Mark Tasng of British Telecom.
The first implementation of Hope used [[strict evaluation]], but there have since been [[lazy evaluation]] versions and strict versions with lazy constructors. A successor language Hope+, (developed jointly between [[Imperial College]] and [[International Computers Limited]] (ICL), added annotations to dictate either strict or lazy evaluation.<ref name=annotations>{{cite book |last1=Kewley |first1=John |last2=Glynn |first2=Kevin |date=1989 |chapter=Evaluation Annotations for Hope+ |editor1-last=Davis |editor1-first=Kei |editor2-last=Hughes |editor2-first=R. J. M. |title=Functional Programming: Proceedings of the 1989 Glasgow Workshop, Workshops in Computing |pages=329–337 |place=London, United Kingdom |publication-date=1990 |publisher=[[Springer-Verlag]]}}</ref>
