Glossary entry (derived from question below)
English term or phrase:
Working with appropriate individuals and entities... will speak
Spanish translation:
... el Programa tratará con autoridad/con conocimiento de causa/de modo fidedigno [véase a cont.]
English term
Belize
Works in: English to Spanish, Spanish to English
Working with appropriate individuals and entities... will speak
Working with appropriate individuals and entities, the Programme will speak authoritatively on causes of food insecurity and advocate for a change at policy level to ensure improved resilience of vulnerable children.
En la medida en que se trabaje con personas y entidades adecuadas, el Programa se dirigirá con autoridad....
Non-PRO (1): Rosa Paredes
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Proposed translations
Spain
Sworn/Legal/Business, +20yrs, APTIJ
Native in: Spanish
Works in: English to Spanish
... el Programa tratará con autoridad/con conocimiento de causa/de modo fidedigno [véase a cont.]
"Al trabajar con las personas y las entidades adecuadas, el Programa hablará de/tratará las razones de la inseguridad alimentaria ***con autoridad/con conocimiento de causa/de modo fidedigno*** y abogará en favor de un cambio en el ámbito de las políticas para garantizar una mayor resistencia de los niños vulnerables"
Argentina
30+ years of experience
Native in: Spanish
Works in: Spanish to English, English to Spanish, English, and 1 more.
al trabajar con las personas y entidades apropiadas, el programa hablará con autoridad
Mexico
30+ years in financial, business, legal
Native in: Spanish (Variant: Latin American) 
Works in: English to Spanish, French to Spanish, Portuguese to Spanish, and 1 more.
Discussion
I didn't see the whole picture, you are both right!
Thanks!