Senator Mike Sonko (Nairobi County) and Hosea Ochwangi (nominated) have been listed among the worst performers in plenary discussions in the Senate in 2015.
A report by Mzalendo Trust also revealed that 27 Members of Parliament did not contribute to plenary discussions in the National Assembly at all in 2015.
Five of the 27 legislators have never given their maiden speech in the house since they were elected in March 2013, according to the report.
They include: Alex Kosgey, Kipruto Moi, Oscar Sudi, Gonzi Rai and Tirus Ngahu.
Nairobi County had the highest number of silent legislators.
The findings reveal a continued trend that a third of MPs hardly contribute anything of substance to debate.
In 2015, 118 MPs spoke less than 20 times in the National Assembly.
Two thirds of the Senators had over 50 speech counts.
“This is a dismal report given participation to debate is one of the key metrics in ensuring an MP fulfills his overall responsibility of representation, budgeting, oversight and legislation. Although the number of speech counts in plenary discussions is not indicative of the quality of input, it could allude to low capacity to exercise their Parliamentarians roles. The high level of poverty and poor service delivery in the country does not warrant a legislator remaining silent in Parliament,” said Jessica Musila, Executive Director, Mzalendo Trust.
Chrisantus Wamalwa and Naomi Shaban emerged the most active contributors to debate in the National Assembly.
Fatuma Dullo (nominated) and Mutula Kilonzo Jr. (Makueni) were the leading contributors in the Senate.
The report also ranked elected Parliamentarians according to their counties and Siaya, Kakamega and Homabay led the rest.
The most active chairpersons were; Boni Khalwale and Samuel Chepkonga in the Senate and National Assembly respectively.
The Parliamentarians debate report card is compiled by Mzalendo.com based on the official Hansard contributions published by Parliament after each sitting.