The following is an excerpt from a research report titled Haskell vs. Ada vs. Awk vs. ... An Experiment in Software Prototyping Productivity by Paul Hudak and Mark P. Jones published in October 1994.

Source: https://www.cs.yale.edu/publications/techreports/tr1049.pdf (Page 14)

Lessons Learned

Haskell appeared to do quite well in the NSWC experiment; even better than we had anticipated! The reaction from the other participants, however, in particular those not familiar with the advantages of functional programming, was somewhat surprising, and is worth some discussion. There were two kinds of responses:

In conducting the independent design review at Intermetrics, there was a significance sense of disbelief. We quote from [CHJ93]: "It is significant that Mr. Domanski, Mr. Banowetz and Dr. Brosgol were all surprised and suspicious when we told them that Haskell prototype P1 (see appendix B) is a complete tested executable program. We provided them with a copy of P1 without explaining that it was a program and based on preconceptions from their past experience, they had studied P1 under the assumption that it was a mixture of requirements specification and top level design. They were convinced it was incomplete because it did not address issues such as data structure design and execution order."