When you need great research to drive decision-making, GravitasOPG delivers.

Our work is all about people and we are experts at understanding, measuring and explaining thoughts and behaviour. Since 2001, as Gravitas Research and Strategy our research has driven decision-making in the public sector. In 2020, we became part of the One Picture Group – which offers commercial research and strategy services – and rebranded as GravitasOPG, continuing on the same work that we love to do.

We are trusted with some of New Zealand’s most vital and sensitive national research projects. Our services are sought out to fill information gaps, understand complex problems, measure service delivery and impact, and to inform policy and investment.

GravitasOPG offers a team of experienced consultants, analysts, and a fieldwork team that can implement online, CATI, mystery shopping and intercept data collection.

Whether you need a high-level strategy, a deep-dive evaluation, or robust data to stand up in a legal setting, GravitasOPG delivers research you can rely on.

Our success is down to the creativity and experience of our team. Our consultants come from a wide range of backgrounds and disciplines. They work at GravitasOPG for the opportunity to apply intellectual talents to real-life, important challenges.

We understand that good decisions rely on high quality, clearly interpreted and timely information – and we take this mindset to every project.

The diversity of staff experience, background and skills ensures your project receives a critical balance of deep and broad expertise. But it’s not just about the quality of the outcome – we are committed to being flexible, fast and easy to work with.

Part of the Gravitas team since its inception in 2001, Tania is a seasoned research and evaluation practitioner with over 30 years of experience helping public-sector organisations make confident, evidence-based decisions. She is known for her collaborative working style, clear communication, and ability to translate complex findings into practical insights that support real-world outcomes.

Tania brings deep expertise in the design and delivery of large-scale mixed-methods studies, data integration, and innovative engagement approaches. Her work spans immigration, transport, justice, and customer experience, with a particular passion for cross-cultural research and ensuring the voices of vulnerable and hard-to-reach populations are genuinely heard.

As part of the GravtiasOPG team since 2016, Sue is an experienced research and evaluation practitioner passionate about making a difference to social outcomes by supporting evidence-based decision making for public sector organisations.

Sue brings experience across a wide range of data collection and analysis methodologies, with extensive experience in the design and implementation of mixed-methods evaluations. She has experience across justice, housing, family and sexual violence prevention, social development, education, health and wellbeing. Sue holds a Post Graduate Diploma in Social Science Research Methods.