containing a postscriptum to the extended abstract of the author's paper.

Covering letter for the 3rd batch of papers and to their list with names of Program Committee's members assigned to review corresponding papers, and this list itself.

The author thanks the addressee for his willingness to participate at the IFIP 77 Congress Panel "Natural Language Understanding".

"Development of Fundamental Concepts of Algorithms and Data Structures With Emphasis on the Modelling of Concurrency in Computations and on Representations Suited to Problem Execution on Multiprocess Computer Systems".

for notes regarding the content of the author's paper. The author asks with apology to consider these notes as the paper's abstract though they neither conform to the requirements nor come before the deadline.

Attendance at the Program Committee meeting to be held in Amsterdam is discussed. The author requests also to complete the enclosed evaluation form intended for initial ranking of submitted papers.

Covering letter for the 4th batch of papers and to their list with names of Program Committee's members assigned to review corresponding papers, and this list itself.

for authors.

A.Ershov's paper "On the Essence of Compilation" is accepted. The attachment to the letter contains the tentative program of the Conference.

on rejection of A.Ershov's, S.Pokrovsky's and G.Stepanov's paper "The Internal Language of a Multi-Language Optimizer".

Covering letter for the Tentative Program of the Conference and this Program itself. Also the proposed sessions chairmen are requested to approve their participation, and any constructive suggestions regarding the program format are appreciated.

notification of the forthcoming completion of the survey on parallel programming, of the coming visit to the USA and the possibility to visit Cambridge if there will be an invitation from the MAC Project

with ratings of submitted papers.