"collectively develop" is a correct and usable phrase in written English.
It can be used in many contexts, typically to imply that a group or team is working together towards a common goal or to create something. For example, "We will collectively develop a new strategy to help our business succeed."
The public and private sectors need to collectively develop new ways to manage water.
Rather than leaning on organizational principles designed for an older time, companies should collectively develop new strategies to remove the remaining challenges to working from home.
Students will collectively develop a definition though discussions and debates of several ancient philosophical theories by individuals like Plato, Anaxinander, Aristotle, etc.
Together, they identify the root causes and collectively develop a closer relationship, working together to implement the solutions that are created.
Human beings collectively develop rules to aid them in their efforts to maximize their happiness.
We obviously want to learn too, and collectively develop the field.
Typically, such systems are constantly and collectively developed (co-developed) further by a variety of individuals within the organization.
We then collectively developed and presented three competing visions in the form of storylines.
Over time, analysts have collectively developed some informal rules for reading polls just like this one.
"That form of collectively developed knowledge – actionable, informed, motivated by the public good – is what is regionally important all across this country.
The computer industry and other business sectors are collectively developing the next level of Internet standards the common glue that will make all these web services stick together.
